What is this factor?

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It appears like it must have fire in it. It has small air inlet and no exhaust. It was produced by Dietzgen. They make surveying and drafting gear.

There&#039s a huge steel valve with a lever that controls a flapper in the bottom. A bulge in the tin cover lines up with the word CLOSE on the casting to leave the flapper closed.

It was in a thrift shop listed as a hand warmer. I doubt it.

Anyone have a clue?

IMG_20190920_123650.

IMG_20190920_123708.

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