You will be happy to know this pantograph are manufactured by a Kolkata base company... The name of the company is STONE INDIA...
Source: click here
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Raising the pantograph is more on driver decision and on some IR Technical directive... In case the loco is hauling a Oil Tanker it may raise its front pantograph... The reason is to avoid the sparks...
more... that are generated in the contact point [pantograph and wire] may not come in contact with the Oil Tanker... In winter season the driver can raise front pantograph...