US PATENT SUBCLASS 122 / 271
.~.~ Vertical

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

235.11  DF  WATER TUBE {52}
266  DF  .~ Internal fire tube {5}
271.~.~ Vertical {1}
272  DF  .~.~.~> Central magazine

DEFINITION

Classification: 122/271

(under subclass 266) Devices whose tubes are in a substantially vertical position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

348, for that type of boiler heated by fluid fuel.