US PATENT SUBCLASS 432 / 177
.~.~ Chamber exhaust transfers heat with chamber wall

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}
177.~.~ Chamber exhaust transfers heat with chamber wall

DEFINITION

Classification: 432/177

(under subclass 159) Apparatus in which an exhaust flue from the work chamber is within or in heat exchanging relationship with a wall of the work chamber to transfer heat therewith.