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1940s: Oscilloscope meter creates waveforms. Man's mouth and lips move. Students with tooth props speak in unison at desks.

   

1940s: Oscilloscope meter creates waveforms. Man's mouth and lips move. Students with tooth props speak in unison at desks.

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1940s: Oscilloscope meter creates waveforms. Man's mouth and lips move. Students with tooth props speak in unison at desks.