US PATENT SUBCLASS 122 / 172
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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}
172.~.~.~ Header

DEFINITION

Classification: 122/172

(under subclass 166) Devices having water tubes in communication with headers located within the flue.

SEE OR SEARCH THIS CLASS, SUBCLASS:

170, for vertical flue boilers having coiled water tubes communicating with heaters located in the flue.

178, for similar structures of water tubes.