US PATENT SUBCLASS 250 / 289
.~ With evacuation or sealing means

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

281  DF  IONIC SEPARATION OR ANALYSIS {7}
289.~ With evacuation or sealing means

DEFINITION

Classification: 250/289

(under subclass 281) Subject matter having means producing a subatmospheric pressure environment for the selecting means or means to maintain the pressure of the environment of the selecting means sub atmospheric.