gas plate is not in our dictionary (yet). Here's what it could mean:

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noun

A cooking appliance with one or more burners that are fueled by a combustible vapor, such as propane or natural gas, often designed to be portable or sit on a countertop.

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At two, they went into the teachers’ lunch room where there was a gas plate.

From "A Tree Grows in Brooklyn" by Betty Smith

She heated Drummer’s wash water on a gas plate in the boss’s office.

From "A Tree Grows in Brooklyn" by Betty Smith