US PATENT SUBCLASS 237 / 63
.~.~ Pump

Current as of: June, 1999
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237 /   HD   HEATING SYSTEMS

56  DF  WATER {5}
59  DF  .~ Circulation {4}
63.~.~ Pump {1}
64  DF  .~.~.~> Steam displacing

DEFINITION

Classification: 237/63

(under subclass 59) Subject matter having a pump for circulating the water.