US PATENT SUBCLASS 432 / 155
.~.~ Chamber heated by multiple combustion products flues

Current as of: June, 1999
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432 /   HD   HEATING

120  DF  WORK CHAMBER HAVING HEATING MEANS {12}
121  DF  .~ Having means by which work is progressed or moved mechanically {9}
155.~.~ Chamber heated by multiple combustion products flues

DEFINITION

Classification: 432/155

(under subclass 121) Apparatus in which the heat emitting surface is heated by tortuous, branched or multiple combustion product flue means.