3478647 Alexander Graham Bell\'s Dead Ear Phonautograph, 1850; (add.info.: Illustration depicting Alexander Graham Bell\'s Dead Ear Phonautograph, where sounds directed to the mouthpiece caused membrane, modelled on the action of the human ear, to vibrate, so moving a stylus which drew tracings on smoked glass. Dated 19th Century.); Universal History Archive/UIG; out of copyright.

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TOP27535752

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達志影像

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RM

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須由TPG 完整授權

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