US PATENT SUBCLASS 122 / 181
.~.~.~ Vertical spur

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

135.1  DF  FLUE {4}
155.1  DF  .~ Vertical {16}
166.1  DF  .~.~ With internal water tube {12}
181.~.~.~ Vertical spur

DEFINITION

Classification: 122/181

(under subclass 166) Devices having vertical spur water tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

133, for vertical fire tube boilers, with vertical spur water tubes.