US PATENT SUBCLASS 122 / 441
.~ Steam

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

412  DF  FEED HEATERS {17}
441.~ Steam {1}
442  DF  .~.~> Injected {1}

DEFINITION

Classification: 122/441

(under subclass 412) Subject matter comprising means for heating the feed water by means of live or exhaust steam.