US PATENT SUBCLASS 122 / 201
.~.~ Subjacent internal fire tube

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

*  DD  HORIZONTAL CYLINDER {6}
195  DF  .~ Water tube {7}
201.~.~ Subjacent internal fire tube

DEFINITION

Classification: 122/201

(under subclass 195) Devices in which the water tubes are provided with internal fire tubes located in the combustion chamber beneath the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

267, for internal fire tubes within the water tubes.