US PATENT SUBCLASS 332 / 139
.~.~.~ Crystal oscillator type


Current as of: June, 1999
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332 /   HD   MODULATORS

117  DF  FREQUENCY MODULATOR {6}
137  DF  .~ Including electron discharge device {1}
138  DF  .~.~ Particular oscillator circuit {2}
139.~.~.~ Crystal oscillator type {1}
140  DF  .~.~.~.~> With separate modulator tube (e.g., reactance tube)


DEFINITION

Classification: 332/139

Crystal oscillator type:

(under subclass 138) Subject matter in which frequency generation is controlled by a crystal resonator such as a piezoelectric crystal.

SEE OR SEARCH CLASS

331, Oscillators,

73, 116, 139, and 154+ for piezoelectric-type oscillators.