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Conceptual diagram of a beat frequency oscillator based audio generator. | Download Scientific Diagram
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File:Vintage RCA Beat Frequency Oscillator, Model TMV-134-A, 5 Vacuum Tubes, Made In USA, Circa 1936 (36198979981).jpg - Wikimedia Commons
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File:Beat frequency oscillator "STI 4032" from German company Rohde und Schwarz (1944).jpg - Wikimedia Commons
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