BELL'S PROT OPHONE. E ARTICULATING PHOTOPHONE—THE TRAN SMITTER. SELENIUM RECEIVER. ARTICULATING PHOTOPHONE—THE, scientific american, 1881-01-01

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BELL'S PROT OPHONE. E ARTICULATING PHOTOPHONE—THE TRAN SMITTER. SELENIUM RECEIVER. ARTICULATING PHOTOPHONE—THE, scientific american, 1881-01-01

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