(under subclass 18) Subject matter wherein two or more frequency beating or heterodyning means, or stages, are effectively connected in the A.F.S. loop of the controlled oscillator.
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31, for oscillators with plural heterodyne stages in the A.F.S. loop, but wherein the discriminator is of the single input type, i.e., no comparison of the oscillator frequency with a reference frequency or source is made at the discriminator.
38+, for beat frequency oscillator systems including plural beating or heterodyning means.
