(under subclass 158) Subject matter wherein means are provided for effectively removing the crystal from the oscillator circuit and for effectively substituting another crystal therefor. Usually, but not necessarily, the crystals are selectively connected and disconnected from the oscillator circuit by an electrical circuit maker and breaker.
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40, for beat frequency oscillators wherein the frequency may be controlled by selectively substituting piezoelectric crystals.
49, for plural oscillator systems provided with means for selectively connecting one or more of two or more oscillators to a common output circuit.
179, for step-frequency change oscillator frequency adjusting means in general wherein LC circuits resonant at different frequencies may be interchangeably connected in the
