US PATENT SUBCLASS 122 / 138
.~.~.~ 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}
137  DF  .~.~ Plural {1}
138.~.~.~ Water tube

DEFINITION

Classification: 122/138

(under subclass 137) Devices having water tubes in communication with the boilers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53, 102, 104, and 105, for structure including horizontal flue boilers.

140+, for horizontal flue boilers with internal water tubes.

153+, for horizontal flue boilers with water tubes exterior of the boiler.

195, for horizontal cylindrical fire-tube boilers with similar arrangement.