How the PARM 1 and PARM 2 anti-tank Mines Work

Поделиться
HTML-код
  • Опубликовано: 30 июн 2024
  • PARM 1 and PARM 2 DM-12 anti-tank mines are in use with Ukraine. How do they work?
    I thought it would be interesting in this video to take a look at an unusual, but lethal and useful weapon which Ukraine is operating. The PARM-2 mine. This was sent as part of an aid package which Germany claimed included 2,000 mines, so we don’t know how many of those were PARM-2s. It’s a very interesting weapon, differering from the usual mines as we shall see.
    PARM stands for PanzerAbwehrRichtMine. Or, anti-tank directional mine. They are off route mines which when triggered fire small, fin-stabilized rockets. Different than usual anti-tank mines which are triggered and detonated under the vehicle. These aren’t the only off-route anti-tank mines in service-for example, Poland has the MPB.
    The mine first entered service as the PARM 1 in 1988. It is mounted on a s small, flexible tripod. This tripod can spin 360 degrees, elevate 90 degrees or depress 45 degrees, allowing the system to be rigged and set up in a number of different locations.
    It is suitable for both protective use-such as protecting a vital convoy route, or tactical use. Intended to disrupt the movement of enemy forces.
    The mine can be fired by command, pressure plate or by a tripwire. With the tripwire, it is an optical cable placed on the road. Once a heavy vehicle rolls over it, this cable then triggers the ignition of the charge. This fires the projectivle to the target.
    Now, they don’t have to strike the first weapon in a convoy either. PARM-2 can be set to skip 9 vehicles before detonating, allowing for it to target key vehicles in the center of the convoy. For example, if a recon patrol spots an enemy convoy with the priority target being, say, a fuel truck-the lead vehicle such as a BMP-1 can pass over it, the next vehicle can and so on, until the priority target arrives. Then, it detonates.
    The PARM 1 has an effective range of 2 to 40 meters. The PARM 2 is upgraded with a range of 100 meters. The PARM 2 also has an upgraded warhead allowing for armor penetration of 750 millimeters and even capabilitiy against reactive armour.
    For point of reference, the BMP-1 has armor thickness of 33 millimeters. The T-72 has armor thickness of around 700mm at the front of the turret and hull. The BTR-80-10mm in the hull.
    These are powerful weapons. Fast too-once triggered, they travel at 120 meters per second. They also quite light and easily transported-weighing just 20 kg. Meaning they can be quickly and easily taken to an ambush point.
    So, there we have the PARM 2. I think it’s quite a cool weapon and worth having a closer look at how it works. If you enjoyed the video, I’d appreciate it if you’d click like and also subscribe.
    Cheers

Комментарии • 151

  • @baer0083
    @baer0083 Год назад +34

    One little interesting fact: The glass fibre cable detecting the apporaching enemy vehicle cant be detected by a metal detector. Means that, if you dont dig it up or rip it out of the ground, you wont find it until its too late.
    That was a complicated sentence...

  • @FlyWithMe_666
    @FlyWithMe_666 Год назад +30

    00:17 In 🇩🇪 -> Panzer = tank | Abwehr = anti, defense | Richt = directional | Mine = mine || = directional anti-tank mine = PanzerAbwehrRichtMine = PARM

    • @DragnEYE
      @DragnEYE 5 месяцев назад

      Actually I think PARM is short for parmesan cheese.

  • @bleakfeather7004
    @bleakfeather7004 2 года назад +51

    What a nasty little device. And that tripwire function is pretty cool too.
    Effectively what Germany has done is over-engineer the IED. But it's good, because lashing artillery shells together is time consuming and wastes ammunition.

    • @suchomimus9921
      @suchomimus9921  2 года назад +6

      That's a good comparison. A more effective and less discriminate IED.

    • @bleakfeather7004
      @bleakfeather7004 2 года назад +5

      Oh I can think of a few clever ways to hide this little tri-pod of death.

    • @suchomimus9921
      @suchomimus9921  2 года назад +5

      @@bleakfeather7004 Yeah, the fact it can be rotated and angled different ways opens up so many possibilities for destruction and places to hide it.

    • @markkoreeyvmarkko
      @markkoreeyvmarkko Год назад +5

      This mine can be easily placed even in urban areas. Inside a building or on top of a building. That 45° angle makes it a very dangerous weapon.

    • @gilde915
      @gilde915 5 месяцев назад

      And if you are using a couple of them...preprammed lets say first vehicle and "put in number " the last vehicle...upsi road blocked...and prearranged artillery...it becomes nasty realy ....realy fast

  • @UnknownUser-pf9rk
    @UnknownUser-pf9rk 2 года назад +63

    Another weapon being sent to Ukraine I had no idea existed! The skipping vehicles part was genious!

    • @suchomimus9921
      @suchomimus9921  2 года назад +7

      Yeah, it's a very well designed mine.

    • @MisterW0lfe
      @MisterW0lfe Год назад +4

      @@suchomimus9921 skipping vehicles also allows several mines to be set up to strike the column simultaneously

    • @terjeoseberg990
      @terjeoseberg990 Год назад +1

      @@MisterW0lfe, Good idea.

    • @telesniper2
      @telesniper2 Год назад

      That's a vital part of the design. Otherwise, they could have an expendable vehicle lead the convoy. You can use your imagination as to just what that might entail. MACVSOG used to use this tactic to protect themselves against anti personnel mines that might be hidden on trails. They would take a viet cong prisoner and tie their hands and gag them, and make them walk ahead of them on the trail at gunpoint.

    • @UnknownUser-pf9rk
      @UnknownUser-pf9rk Год назад

      @@Johnconno I have but no idea what it has to do with my comment.

  • @michaelcorbidge7914
    @michaelcorbidge7914 Год назад +7

    That explains what I thought were missile strikes but were called mine hits .

  • @phalnx2614
    @phalnx2614 2 года назад +9

    Super interesting, never knew this kind of mine before.

  • @daveinromania
    @daveinromania Год назад +12

    You should have put a link of this to the video on what you did yesterday on PARM-2 Mine Hits Russian Vehicle Supposedly Carrying Officers. It just compliments it so much!

    • @suchomimus9921
      @suchomimus9921  Год назад +7

      Good suggestion. I will switch the "suggested videos" at the end to this.

  • @randlerobbertson8792
    @randlerobbertson8792 Год назад +12

    I think these lethal mines are emminently suitable for use in Ukraine against Russian invading forces. Its the sort of truly wicked device that would make you think twice about wanting to travel anywhere in Ukraine in any Russian armoured vehicle.

  • @Creppystories123
    @Creppystories123 2 года назад +6

    Thanks for this I actually really wanted to know about this mine

  • @michaelkimber6203
    @michaelkimber6203 Год назад +2

    Devilishly clever. Perfect.

  • @rvail136
    @rvail136 Год назад +3

    They recently got a senior officer group on the southern front NW of Meriopol...the funny part of the 2nd vehicle rolled over because the driver paniced and took the curve far too fast and killed half the people in his vehicle as well...

  • @m.c.5744
    @m.c.5744 Год назад +1

    Important topic, thanks.

  • @plurplursen7172
    @plurplursen7172 Год назад +1

    damn they are handy and super usable. You could setup a complete ambush, making the enemy fire at ghosts in panic. Send more! It should detect the weight also. And be able to skip way more

    • @zhufortheimpaler4041
      @zhufortheimpaler4041 Год назад

      its likely what initiated the very famous ambush near brovary (north east of Kyiv) in the initial stage of the war.

  • @cosmicdebris2223
    @cosmicdebris2223 Год назад +2

    oh dear, I'm going to have to help on this one regarding the German language; PARM stands for "PanzerAbwehrRichtMine,", phonetically this is said something like " pantser-abvehr-richt-meeneh " the richt is said something like ri as in re in english and cht as in loch the ch bit but with the Scottish accent. That's how it's said. It's comprises of several words making up one word, and those words are (this is where it gets self explanatory):
    Panzer (Tank/Armour) P
    Abwehr (defence/repulsion) A
    Richt (directional) R
    Mine (Mine!) M
    Hope this helps.

    • @suchomimus9921
      @suchomimus9921  Год назад

      Thanks for the info--German words are very trick for me to grasp. Good to have the meaning of the abbreviation--cheers

    • @cosmicdebris2223
      @cosmicdebris2223 Год назад

      @@suchomimus9921 yes, being half German half English I can sort that sort of thing. The German language is tough especially with longer words. Words are often long in German (which we brits laugh about) but only because over time they have simply joined several words together to describe something. When one speaks German one does however often immediately see what is meant with the word as in this example that describes all aspects of the function... in one word. :D

  • @billsmith5166
    @billsmith5166 Год назад +6

    Very timely info based on what you showed us yesterday. One question for anyone that knows.. is it remotely controlled to fire at the 9th vehicle, or would that need to be known well in advance of the arrival of the convoy? Keep up the good work.

    • @suchomimus9921
      @suchomimus9921  Год назад +5

      It is preprogrammed. So, can be se tup to impact when the 9th vehicle presses the detonator cable.

  • @user-xv5tz1cl5y
    @user-xv5tz1cl5y 5 месяцев назад

    Seems like a very flexible ORC stopper. Has to suck being an ordinary foot soldier these days.

  • @terrystephens1102
    @terrystephens1102 Год назад +1

    Great piece of kit that has apparently scored quite a few hits.

  • @ActionPanda-g5n
    @ActionPanda-g5n Год назад +1

    Fascinating

  • @insain0999
    @insain0999 Год назад +1

    Thanks for sharing, Suchomimus.

  • @JoseFernandez-wu8pj
    @JoseFernandez-wu8pj Год назад +1

    Nice

  • @GameLeaderR
    @GameLeaderR Год назад +8

    They seem overly complicated compared to regular AT mines but at the same time they look so cool that I can't help but love them more lol. Plus, the more advanced computing in it allows for some real cool possibilities. I could see these attached to a camera or laser sensor so you could "mine" a road from a slight distance.

    • @asator2746
      @asator2746 Год назад +13

      Like he said it can be detonated when the target vehicle drives over a fiber optic cable, command detonated, or detonation via infra red sensors. And since it is a directed mine, I think it can hardly be compared to an ordinary anti-tank mine. You can shoot them out of roadside ditches or down from buildings and no longer have to rely on the road itself in order to hide it. It is more of an industrially produced IED than a simple mine.

  • @rjs3590
    @rjs3590 Год назад +1

    The video of the kill this thing achieves is hella impressive.

  • @chrisliles1668
    @chrisliles1668 Год назад +1

    awesome

  • @totalnerd5674
    @totalnerd5674 2 года назад +4

    So its basically the father of all claymore mines? Cool

    • @Mugdorna
      @Mugdorna Год назад

      Claymore predates the PARM

    • @louie3404
      @louie3404 20 дней назад

      ​@@Mugdorna I think he knows that, i think he was just referring to it like the more badass, big daddy Claymore mine, not that it was older

  • @lukeamato2348
    @lukeamato2348 Год назад +1

    Things look like freakin lazerbeams

  • @callejansson682
    @callejansson682 Год назад +1

    The AT4 is also propert to be a roadside mine. Note the shortest distans to target, and lets party!

  • @randlerobbertson8792
    @randlerobbertson8792 7 месяцев назад

    These things are remarkable

  • @fairybeliever4479
    @fairybeliever4479 2 года назад +31

    Never even heard about this one before. Thank you 🙏 Slava Ukraini ❤️🇺🇦

  • @Zalinskk
    @Zalinskk Год назад +2

    Hi you do great videos, but please normalise your audio, the volume jumps from low to high and vice-versa.

  • @NANDOFFDataRecovery
    @NANDOFFDataRecovery 2 года назад

    cheers

  • @marks.6480
    @marks.6480 Год назад +2

    i recently saw a video of Russian armour being hit by a PARM. The shaped charge cut right though both sides of the vehicle.

  • @klaustremetsberger1101
    @klaustremetsberger1101 7 месяцев назад

    Im my opinion the most interesting feature is that PARM hit the enemy vehicle in the side and does not explode under the front wheel or the mine roller.

  • @redhen2123
    @redhen2123 Год назад +2

    Deutsche Qualität.

  • @bastogne315
    @bastogne315 2 года назад +1

    Essentially a platter mine for professionals

  • @SalihGoncu
    @SalihGoncu 6 месяцев назад

    they can also hit from behind the convoy.

  • @peterdawson6239
    @peterdawson6239 Год назад +2

    Your videos are informative, however, please attend to the audio quality of the videos. The sound is faint and varies which ruin the overall quality of the video and information there in.

  • @JetBlackmf
    @JetBlackmf Год назад

    You got any for sale ?? used of course.

  • @dirkmahler7336
    @dirkmahler7336 Год назад +1

    We will deliver the new fiber optic cable

  • @wor53lg50
    @wor53lg50 Год назад +1

    With a little imagination and RC enthusiast mechanical knowledge you could easily turn this into a duel system with a sagger missile type weopon designed into it aswell as being a mine thats dumb fired...

    • @teeanahera8949
      @teeanahera8949 Год назад

      *dual. Duel is when you stand back to back then walk 20 paces, turn and fire at each other. Or a sword fight.

    • @wor53lg50
      @wor53lg50 Год назад

      @@teeanahera8949 sorry i bad, your right my spelling is not the greatest, but im sure people will get the drift, but thanks for pointing DUAL out...

  • @SG-eb4uw
    @SG-eb4uw Год назад +1

    Parm stands vor panzer abwehr richt mine. I dunno what u said, but tim sure u butchered the pronounciation 🙈 but very interesting video and concept

  • @huswsimonbla
    @huswsimonbla 2 года назад +13

    Sorry but I laughed my ass off when you tried to say "Panzer-Abwehr-Richtmine" it is very difficult to say so no hate

    • @suchomimus9921
      @suchomimus9921  2 года назад +3

      Yes, I'm pretty certain I butchered it bad.

    • @Kroetens
      @Kroetens Год назад +5

      @@suchomimus9921 Try to say it like pun-sir up-where rigged-me-neh :)

  • @bastogne315
    @bastogne315 2 года назад +1

    Be careful Suchi. 2m is damn close to be when you chuck one of them.

  • @brianv1988
    @brianv1988 2 года назад +2

    Yeah I seen a lot of different version of these directional mine sometimes they even look like ordinary box with shape charges inside them instead of having a RPG Style flying out it shoots a shaped charge dream of molten whatever you call it to penetrate the armor also with different kind of ways to detonate them

    • @brianv1988
      @brianv1988 2 года назад +1

      Some kinds can have acoustic microphones to pick up the sound of heavy tanks or armored vehicles ordinary tripwires, pressure plates, manned triggered it's crazy on a different types of mines and anti-personnel weapons there is out there from the past and present and onto the future

    • @suchomimus9921
      @suchomimus9921  2 года назад +2

      One source said this one had a microphone. But it was the only one saying the PARM did, so I didn't include it in case it was inaccurate. But that sounds pretty cool--I expect it is sensitive enough that it wont detonate on cars, lorries, tractors etc.

    • @brianv1988
      @brianv1988 2 года назад

      Don't know exactly how it does it but it Maybe the sounds of tanks or heavy armored vehicles are recorded in imprinted into a system so it can identify what is friend an foe just my idea don't really know how they work just guessing it give me a idea to look up about it now

    • @brianv1988
      @brianv1988 2 года назад

      @@suchomimus9921 ruclips.net/video/praws6uM--A/видео.html. Some old footage from cold war-style off Route mine

    • @brianv1988
      @brianv1988 2 года назад

      @@suchomimus9921 here is a really early American made one. ruclips.net/video/u3JFJrKZXXA/видео.html

  • @ArcolaBridge
    @ArcolaBridge 2 года назад +1

    Good morning from usa

    • @suchomimus9921
      @suchomimus9921  2 года назад +1

      Good morning from Taiwan!

    • @ArcolaBridge
      @ArcolaBridge 2 года назад

      @@suchomimus9921 have you been to the original boba tea shop?

    • @suchomimus9921
      @suchomimus9921  2 года назад +1

      @@ArcolaBridge I have--or at least the one claiming to be first. I like boba tea alot. Nice and sweet.

    • @ArcolaBridge
      @ArcolaBridge 2 года назад

      @@suchomimus9921 there 2 I've claiming to be the real original. I'm shocked all the way back in the 80s in taiwan people were enjoying delicious boba tea while in minnesota we didnt get it until the mid 2000s really. Now the state has 20+ boba exclusice shops and counting. Were even getting mochi doughnut shops too. Crisp yet gooey textured glutinous rice flower doughnuts with icing. It's like a seseme ball 2.0 without seseme.

  • @matthewhuszarik4173
    @matthewhuszarik4173 5 месяцев назад

    20kg is light?

  • @robertotamesis1783
    @robertotamesis1783 Год назад +1

    It looks like a big audio din plugs , I'll name it the "Pallidin"

  • @bondisteve3617
    @bondisteve3617 2 года назад

    Ta!

  • @johnzajac9849
    @johnzajac9849 Год назад +1

    'PanzerAbwehrRichtMine' = PARM

  • @dcdk1525
    @dcdk1525 Год назад +1

    yo brother, U got the like - I got the superior deal, .. keep em' in flight(videos, enlight)

  • @justinatest9456
    @justinatest9456 Год назад +6

    To see this beast in action check out the video "PARM-2 Mine Hits Russian Vehicle Supposedly Carrying Officers". Spectacular.

  • @RenniePet
    @RenniePet 2 года назад +2

    Why do they call it a "mine"?

    • @Bialy_1
      @Bialy_1 2 года назад

      "Figurative meaning "ruin or destroy by slow or secret methods""
      "in reference to old tactic of tunneling under enemy fortifications to blow them up".

    • @Fin4L6are
      @Fin4L6are 2 года назад +1

      in Russian "mine" is used kinda similarly to a granade sometimes. For example a mortar is a "mine thrower".

    • @Bialy_1
      @Bialy_1 2 года назад +3

      @@Fin4L6are Mortar in Russian is two words for two type of weapons/mortars: "Мортира"(mortira) from latin word mortarium for old big howitzer alike mortars and "Миномёт" ->"mine thrower" for portable modern alike infantry mortars.
      Polish name for mine is "mina" and "mina" in Polish is also an expresion on your face... So you can wonder as a Polish person if this name have something to do with a look on someone face when he just heard a strange sound under his feet after he stepped on a mine...

  • @importantname
    @importantname Год назад +1

    IED is term applied to when the enemy uses them, but the enemy lacks the wealth to have better product promotion and advertising

  • @thewarhead3524
    @thewarhead3524 2 года назад +1

    When are you going to make video about foreign legion?

    • @suchomimus9921
      @suchomimus9921  2 года назад

      It is one I am planning. Got a few I am working on

    • @moa5329
      @moa5329 2 года назад

      @@suchomimus9921 ruclips.net/video/dcp0TYx_eUI/видео.html

    • @thewarhead3524
      @thewarhead3524 2 года назад

      @@suchomimus9921 I really appreciate your replies
      Thanks
      I want to say that please give each single information about this topic

  • @theroidragedtrex7908
    @theroidragedtrex7908 2 года назад +1

    Spicy chicken parm

  • @xisotopex
    @xisotopex Год назад +1

    how are they deployed? can they be deployed remotely with an artillery round, or do they require to be set up in person?

    • @billklatsch5058
      @billklatsch5058 Год назад +2

      obviously some has to set them up on the side of action, how else do you want to get the alignment right and the trigger cable set up...

    • @holokyttaja5476
      @holokyttaja5476 Год назад +1

      Did you even watch the video?

  • @zbyszanna
    @zbyszanna 2 года назад +1

    Something bad has been happening to your audio as of late of time.

    • @suchomimus9921
      @suchomimus9921  2 года назад

      I have been using my works recording room, which I thought would be better since it is soundproof But when I listen back there's a sort of faint buzz.
      I think I will switch to recording from my laptop again.

  • @mravecsk1
    @mravecsk1 Год назад +2

    Combine it with antipersonel mines around it.

  • @YOURMOMCALLSME
    @YOURMOMCALLSME Год назад

    It's pronounced decrease, not decress......

  • @17hmr243
    @17hmr243 2 года назад

    The Armourer's Bench

    • @Bialy_1
      @Bialy_1 2 года назад

      "effective range 70m-80m" where mentioned in this video Polish MPB is effective up to 300m because it is like a bigger brother of the mine that you wanted to claim as "more powerful"... MPB-ZN is 45kg...
      www.army-technology.com/wp-content/uploads/sites/3/2019/04/BELMA-off-route-mine-armour-6.jpg

  • @johnc2438
    @johnc2438 Год назад +1

    Place your bets -- pick a number from 1 to 9! Do ya feel lucky, punk?

  • @simplexj4298
    @simplexj4298 Год назад +4

    Interesting German device! These were developed a decade or two after my own military service. Never heard about these before. I'm sure they will be given good use in Ukraine against the offenders.
    🇺🇦🇺🇦🇺🇦 Slava Ukraini! 🇺🇦🇺🇦🇺🇦 Слава Україні! 🇺🇦🇺🇦🇺🇦

  • @ting2222
    @ting2222 Год назад

    I wonder if there is an option to fire when it hears someone is speaking Russian.

  • @wyslink9354
    @wyslink9354 Год назад +1

    "useful"

  • @blindbrick
    @blindbrick Год назад

    2:51 Armour thickness of 700 mm? That is 0.7 meter

    • @holokyttaja5476
      @holokyttaja5476 Год назад +1

      He is probably talking about effective thickness when compared to homogenous steel armor. The composite is not actually 700mm thick.

  • @erg0centric
    @erg0centric 7 месяцев назад

    Panzerfaust

  • @stephen2583
    @stephen2583 2 года назад +1

    I cant stand hearing ANT-I tank.
    Its ANT-E tank.

    • @bleakfeather7004
      @bleakfeather7004 2 года назад

      Settle down Royal Marine

    • @Bialy_1
      @Bialy_1 2 года назад +2

      @@bleakfeather7004 The corect tittle is keyboard warrior... :P

    • @suchomimus9921
      @suchomimus9921  2 года назад +1

      Force of habit--my work needs me to do voice recordings using American terms. So they've unfortunately slipped into my everyday usage. I pronunce Z in the American way now too.

    • @bleakfeather7004
      @bleakfeather7004 2 года назад

      @@suchomimus9921 Because Z is a letter. Zed is a word.

    • @heybabycometobutthead
      @heybabycometobutthead 2 года назад +1

      @@bleakfeather7004 Zee isn't a letter in English.

  • @parallelsuns1
    @parallelsuns1 Год назад +1

    A very nasty peice of kit. Seems it may of just took out a Russian commander in a speeding light vehicle

    • @suchomimus9921
      @suchomimus9921  Год назад

      There was a video on twitter of the aftermath of a hit on a tank a few weeks ago. It tore right through it.

  • @chadnelson8259
    @chadnelson8259 Год назад +2

    Cheap and devastating device. Taliban used a simpler variation with same results.

  • @6AlphaMikeCharlie9
    @6AlphaMikeCharlie9 Год назад

    PARM = Panzerabwehrrichtmine you butchered that pal 🤣 only joking

  • @christianpethukov
    @christianpethukov Год назад +1

    Definitely not as tasty as chicken parm...

  • @webcrawler9782
    @webcrawler9782 Год назад +1

    pretty nasty little things

  • @fabreezethefaintinggoat5484
    @fabreezethefaintinggoat5484 2 года назад +3

    The Russians already got their hands on it at least a month ago..the amount of r&d that is being transferred to Russia(and most likely China) through these "donations" is mind blowing.

    • @Gr8thxAlot
      @Gr8thxAlot 2 года назад

      By the time they could reproduce anything high tech, NATO will have something better. Russia couldn't likely afford it anyway. China's QC is garbage.

    • @heybabycometobutthead
      @heybabycometobutthead 2 года назад +16

      This stuff is like 40 years old in design, if Russia and China don't know how to make something this simple already, they've got bigger problems.

    • @bastogne315
      @bastogne315 Год назад +1

      They were making this tech from milk churns in Crossmaglen N Ireland in the 1980s. Its basic chemistry and physics dude.

  • @lourencomarques219
    @lourencomarques219 Год назад +2

    frequently used by irakis against american vehicles...

    • @heimdalshorn
      @heimdalshorn Год назад +4

      ...this is stupid BS. It is the first time ever Germany exported this mines to a Non-Nato country....!

    • @AppalachiaTaliban
      @AppalachiaTaliban Год назад

      Your confusing them with EFPs

  • @Peacekeeper-118
    @Peacekeeper-118 7 месяцев назад

    Gosh you butchered that word 🤣

  • @rgbcolor6450
    @rgbcolor6450 Год назад

    750 millimeters ? LOL.. that's almost 30 inches of armor? I'm going to call BullSHIT on that. What tank has almost 3 feet of armor?

    • @holokyttaja5476
      @holokyttaja5476 Год назад +1

      Effective thickness compared to homogenous steel armor. There is no point in saying the actual thickness of the composite armor since there are many types of composites that perform differently.

  • @JoseFernandez-wu8pj
    @JoseFernandez-wu8pj Год назад +1

    Nice