US PATENT SUBCLASS 378 / 138
.~.~ With electron focusing or intensity control means

Current as of: June, 1999
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378 /   HD   X-RAY OR GAMMA RAY SYSTEMS OR DEVICES

119  DF  SOURCE {3}
121  DF  .~ Electron tube {12}
138.~.~ With electron focusing or intensity control means

DEFINITION

Classification: 378/138

With electron focusing or intensity control means:

(under subclass 121) Subject matter including means to converge the beam of electrons into a spot at the target or to control the electron density of the beam.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices,

452+, for cathode-ray tubes provided with focusing means for the electron beam.