US PATENT SUBCLASS 122 / 150
.~.~.~ Rear water 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}
149  DF  .~.~ Return fire tube {2}
150.~.~.~ Rear water tube

DEFINITION

Classification: 122/150

(under subclass 149) Devices with water tubes at the rear of

the flues and fire tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

103, for similar art in a fire tube type of boiler.