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Bitmap Image  |  1996-08-22  |  72KB  |  240x296  |  8-bit (57 colors)
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OCR: BELL'S TELEPHONE The first working telephone invented by Alexander Graham Bell in 1876. In Bell's telephone, sound waves caused thin metal diaphragm to vibrate altering the magnetic field of nearby magnet wrapped copper wire Variations the current caused another diaphragm in an identical receiving telephone to vibrate recreating the original sound waves DATABASE dentical ving ribrate