US PATENT SUBCLASS 122 / 174
.~.~.~ Internal fire tube

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}
174.~.~.~ Internal fire tube

DEFINITION

Classification: 122/174

(under subclass 166) Devices in which the water tubes are provided with internal fire tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

242+, for capillary tubes of this type.

271, and 348, for vertical water tubes with internal fire tubes.