US PATENT SUBCLASS 367 / 113
.~.~.~ Cathode-ray tube

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

87  DF  ECHO SYSTEMS {6}
99  DF  .~ Distance or direction finding {5}
107  DF  .~.~ With indicator {9}
113.~.~.~ Cathode-ray tube

DEFINITION

Classification: 367/113

Cathode-ray tube:

(under subclass 107) Subject matter in which the display device is an evacuated tube with a luminescent screen activated by a controlled electron beam.