Beat-frequency audio oscillator, General Radio, Cambridge MA, c. 1935 - Putnam Gallery - Harvard University - DSC08088

Beat-frequency audio oscillator, General Radio, Cambridge MA, c. 1935 - Putnam Gallery - Harvard University - DSC08088

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self-published work1935 productionscc-zerobeat frequency oscillatorsgeneral radioscientific instruments in the harvard university science center

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