US PATENT SUBCLASS 315 / 390
.~.~.~.~ Tube-type circuit

Current as of: June, 1999
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315 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS

1  DF  CATHODE RAY TUBE CIRCUITS {11}
364  DF  .~ Cathode-ray deflections circuits {16}
387  DF  .~.~ Including feedback circuit {2}
389  DF  .~.~.~ Negative feedback {1}
390.~.~.~.~ Tube-type circuit

DEFINITION

Classification: 315/390

(under subclass 389) Subject matter wherein the circuitry consists only of circuits containing tube devices and is completely void of all solid state devices or circuitry.