US PATENT SUBCLASS 432 / 174
.~.~ Including noncommunicating combustion products flue

Current as of: June, 1999
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432 /   HD   HEATING

120  DF  WORK CHAMBER HAVING HEATING MEANS {12}
159  DF  .~ Combustion products heat work by contact {19}
174.~.~ Including noncommunicating combustion products flue

DEFINITION

Classification: 432/174

(under subclass 159) Apparatus including a flue by which combustion products by-pass the work chamber or exchange heat indirectly with the atmosphere of the work chamber and which are discharged outside of the work chamber.