US PATENT SUBCLASS 432 / 188
.~.~.~ Work chamber indirectly heating by common wall or connecting 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}
186  DF  .~.~ Distinct combustion chamber feeds work chamber {6}
188.~.~.~ Work chamber indirectly heating by common wall or connecting flue

DEFINITION

Classification: 432/188

(under subclass 186) Apparatus in which (1) a wall common to the two chambers conducts heat from the combustion to the work chamber; or (2) a flue conducting the combustion products between the two chambers includes a section indirectly heating the work chamber.