3479254 Alexander Graham Bell\'s photo phone, 1891; (add.info.: Alexander Graham Bell\'s photo phone. vibrations of the diaphragm of the transmitter caused light pulses to fall on a light sensitive selenium cell. Dated 1891.); Universal History Archive/UIG; out of copyright.

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TOP27536263

Source:

達志影像

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RM

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須由TPG 完整授權

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