(under subclass 158) Subject matter wherein two or more separate crystals are effectively connected in circuit with the active element of the oscillator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
40, for plural oscillator systems of the beat frequency type that may include plural crystal oscillators.
161+, for crystal oscillators wherein means are provided for substituting at least one crystal for another crystal in the oscillator circuit.
163, for crystal oscillators wherein a single crystal having three or more electrodes so connected in the oscillator circuit as to present at least two separate resonant paths therein.
