US PATENT SUBCLASS 432 / 190
.~.~.~ Distinct vertically spaced combustion products feed openings to work chamber

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}
190.~.~.~ Distinct vertically spaced combustion products feed openings to work chamber

DEFINITION

Classification: 432/190

(under subclass 186) Apparatus comprising means causing the products of combustion to flow both upwardly and downwardly in the work chamber either alternately, or simultaneously during work treatment.