US PATENT SUBCLASS 122 / 458
.~.~ Heater

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

451 R  DF  FEEDERS {4}
*  DD  .~ Gravity {2}
458.~.~ Heater

DEFINITION

Classification: 122/458

(under subclass 451) Gravity feeders having means for heating the feed water, but not of the automatic type.