US PATENT SUBCLASS 432 / 200
.~ Work chamber having gaseous material supply or removal structure

Current as of: June, 1999
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432 /   HD   HEATING

120  DF  WORK CHAMBER HAVING HEATING MEANS {12}
200.~ Work chamber having gaseous material supply or removal structure {2}
201  DF  .~.~> Air flow-through type {3}
205  DF  .~.~> Having pump, jet or valve means establishing chamber pressure distinct from ambient

DEFINITION

Classification: 432/200

(under subclass 120) Apparatus including an element or structure by which atmosphere of the work chamber is vented or admitted.