US PATENT SUBCLASS 122 / 433
.~.~ Trap outside boiler

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

412  DF  FEED HEATERS {17}
428  DF  .~ Internal conduit {5}
433.~.~ Trap outside boiler

DEFINITION

Classification: 122/433

(under subclass 428) Subject matter where there is a trap or filter outside the boiler, through which the water passes before it enters such feed heater.