Firefighting at Grid Sub Station अग्निसमक कैसे काम करता है

How to Start a Firefighting for Power Transformer at Grid Sub Station
अग्निसमक कैसे चालु करते हैं
Fire fighting for Power transformer at Grid sub station
अग्निसामक कैसे आग बुझाती है
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#Er.JohnKumarDas

[@maninipatra8432]

Nice information 👌