US PATENT SUBCLASS 122 / 153
.~.~ 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}
153.~.~ Water tube {1}
154  DF  .~.~.~> Over bridge wall

DEFINITION

Classification: 122/153

(under subclass 136) Devices having water tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

102, through 105, for horizontal fire tube boilers with water tubes.

138, for plural boilers with water tubes.