US PATENT SUBCLASS 34 / 257
.~.~ Having pressure reducing means

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

245  DF  MATERIAL TREATED BY ELECTROMAGNETIC ENERGY {8}
255  DF  .~ Radio or high-frequency energy {3}
257.~.~ Having pressure reducing means

DEFINITION

Classification: 34/257

Having pressure reducing means:

(under subclass 255) Subject matter including means to establish a vacuum or a suction.