US PATENT SUBCLASS 122 / 170
.~.~.~.~ Header

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

DEFINITION

Classification: 122/170

(under subclass 169) Devices in which the coils communicate with headers located within the flue.