US PATENT SUBCLASS 122 / 118
.~.~.~ Internal


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

44.1  DF  FIRE TUBE {11}
114  DF  .~ Vertical {13}
*  DD  .~.~ Circulation tube {1}
118.~.~.~ Internal


DEFINITION

Classification: 122/118

(under subclass 114) Devices having sleeves, cylinders, or tubes arranged inside the boiler for aiding the boiler circulation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

159, for similar devices within a vertical flue boiler.

408, for similar structure in circulation devices.