US PATENT SUBCLASS 122 / 147
.~.~.~.~ Return fire tube

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

135.1  DF  FLUE {4}
136 R  DF  .~ Horizontal {7}
140.1  DF  .~.~ Internal water tube {7}
145  DF  .~.~.~ Transverse {2}
147.~.~.~.~ Return fire tube

DEFINITION

Classification: 122/147

(under subclass 145) Devices having small fire-tubes, through which the products of combustion pass, after leaving the large horizontal flues, in an opposite direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

142, 146 and 149, for special features.

143, for large flues having spur water tubes therein.