US PATENT SUBCLASS 432 / 107
.~.~ And having externally heated drum surface or indirect heating flue

Current as of: June, 1999
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432 /   HD   HEATING

103  DF  TUMBLER-TYPE ROTARY - DRUM FURNACE {8}
105  DF  .~ Having combustion products generated in or fed to drum {3}
107.~.~ And having externally heated drum surface or indirect heating flue

DEFINITION

Classification: 432/107

(under subclass 105) Apparatus in which the exterior surface of the drum is heated or in which there is a flue extending through the work space of the drum that conducts a hot material in indirect heat exchanging relationship with work material within the drum.