US PATENT SUBCLASS 178 / 71.6
.~.~ Vacuum tube and gas magnetron

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

70 R  DF  REPEATERS {16}
71.1  DF  .~ Automatic in either direction {14}
71.6.~.~ Vacuum tube and gas magnetron

DEFINITION

Classification: 178/71.6

Vacuum tube and gas magnetron:

(under subclass 71.1) Telegraph repeater using a space discharge tube and an ultra or super high power generated electron tube.