US PATENT SUBCLASS 122 / 169
.~.~.~ Coil

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}
169.~.~.~ Coil {1}
170  DF  .~.~.~.~> Header

DEFINITION

Classification: 122/169

(under subclass 166) Devices having coiled water tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

244+, and 247+, for structure of coiled water tubes.