US PATENT SUBCLASS 122 / 250 S
.~.~.~.~ Standpipe

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

235.11  DF  WATER TUBE {52}
247  DF  .~ Coil {2}
249  DF  .~.~ Vertical {3}
250 R  DF  .~.~.~ Fluid fuel {1}
250 S.~.~.~.~ Standpipe

Unofficial Alpha Subclasses: R S

DEFINITION

Classification: 122/250

(under subclass 249) Devices heated by fluid fuel.