(under subclass 138) Oscillators wherein the feedback network includes a piezoelectric crystal for determining the generated frequency of the oscillator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
116, for crystal controlled transistor type oscillators.
158+, for crystal controlled oscillators in general.
SEE OR SEARCH CLASS
310, Electrical Generator or Motor Structure,
311+, for piezoelectric devices and systems not elsewhere classified, and note under SEARCH CLASS of Class 310 subclass 311, the extensive list of classes relating to piezoelectric crystals and systems utilizing crystals. 332, Modulators, particularly
139+, for frequency modulators utilizing piezoelectric crystals.
333, Wave Transmission Lines and Networks,
30, for delay networks, and subclass 72 for filter networks utilizing piezoelectric crystals.
