US PATENT SUBCLASS 331 / 21
.~.~.~ Lock to power line

Current as of: June, 1999
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331 /   HD   OSCILLATORS

1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS {16}
18  DF  .~ With reference oscillator or source {5}
20  DF  .~.~ T.V. sync type {1}
21.~.~.~ Lock to power line

DEFINITION

Classification: 331/21

(under subclass 20) Subject matter wherein means are provided to stabilize or lock the controlled oscillator to the low frequency (e.g., 50, 60 C.P.S.) power current derived from a commercial alternating current supply line.