US PATENT SUBCLASS 122 / 381
.~.~ Bottom and surface

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

379  DF  CLEANING {9}
*  DD  .~ Blow off {3}
381.~.~ Bottom and surface

DEFINITION

Classification: 122/381

(under subclass 379) Devices having means for blowing off the water both at the surface and at the bottom.