US PATENT SUBCLASS 432 / 91
.~ Having means utilizing generated steam in heating work

Current as of: June, 1999
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432 /   HD   HEATING

90  DF  BOILER AND WORK HEATING FURNACE, POT OR OVEN {1}
91.~ Having means utilizing generated steam in heating work

DEFINITION

Classification: 432/91

(under subclass 90) Apparatus including structure by which vapor from the boiler is discharged against or passed in heat transferring relationship to the work in the chamber.