US PATENT SUBCLASS 331 / 43
.~.~ With filter in mixer output circuit

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331 /   HD   OSCILLATORS

37  DF  BEAT FREQUENCY {4}
42  DF  .~ With particular signal combining means (e.g., cavity mixer) {1}
43.~.~ With filter in mixer output circuit

DEFINITION

Classification: 331/43

(under subclass 42) Subject matter wherein a wave filter is included in the mixer output circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

77, for oscillators with a wave filter connected in the output circuit.