US PATENT SUBCLASS 122 / 60
.~.~.~.~ 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}
58 R  DF  .~.~ Drop water firebox {11}
*  DD  .~.~.~ Double {1}
60.~.~.~.~ Alternate smoke return

DEFINITION

Classification: 122/60

(under subclass 58) Devices made with two compartments, with means for alternately passing the products of combustion from one compartment to the other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

57, for water fireboxes with alternate smoke return features.

95, for plural fireboxes.

SEE OR SEARCH CLASS

110, Furnaces,

208+, for similar functions in the furnace art.