US PATENT SUBCLASS 122 / 418
.~.~.~ Attached

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

412  DF  FEED HEATERS {17}
*  DD  .~ Fire-engine boiler {1}
*  DD  .~.~ Auxiliary {2}
418.~.~.~ Attached

DEFINITION

Classification: 122/418

(under subclass 412) Subject matter combined with fire engine boilers with the water heater attached to the boiler or some part of the engine apparatus for keeping the water in the boiler hot when the boiler is not fired up.