US PATENT SUBCLASS 375 / 314
.~.~ Including auxiliary control tube

Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS

295  DF  TRANSMITTERS {6}
309  DF  .~ Keying circuits {6}
314.~.~ Including auxiliary control tube

DEFINITION

Classification: 375/314

Including auxiliary control tube:

(under subclass 309) Subject matter including an auxiliary electron discharge tube in the keying circuit, the conduction of which controls the operation of the transmitter and is

responsive to the keying means.