US PATENT SUBCLASS 122 / 57
.~.~.~ Alternate smoke return

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
*  DD  .~.~ Double water firebox {1}
57.~.~.~ Alternate smoke return

DEFINITION

Classification: 122/57

(under subclass 51) Devices having a two-part water firebox or the equivalent thereof, with mechanism for passing the products of combustion from one part of the firebox to the other part, in order that the smoke may be consumed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

60, for similar functions with a different structure.

SEE OR SEARCH CLASS

110, Furnaces,

208+, for similar art.