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WHAT WAS EDISON WORKING ON WHEN HE CREATED THE PHO...
WHAT WAS EDISON WORKING ON WHEN HE CREATED THE PHONOGRAPH
DE KIEM TRA HKII ANH 9
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3. What was Edison working on when he created the phonograph? A. A telegraph repeater B. A telegraph diaphragm C. A telephone repeater D. A telephone diaphragm
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DE KIEM TRA HKII ANH 9