US PATENT SUBCLASS 122 / 145
.~.~.~ Transverse

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.~.~.~ Transverse {2}
146  DF  .~.~.~.~> Drop water firebox
147  DF  .~.~.~.~> Return fire tube

DEFINITION

Classification: 122/145

(under subclass 140) Devices having water tubes extending across the flues and communicating with the boiler at both ends.

SEE OR SEARCH THIS CLASS, SUBCLASS:

143, for spur tubes in the flue.