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William Edwin Heys
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13,067. Heys, W. E., [Compagnie GÚnÚrale des Phonographes, CinÚmatographes, et Appareils de PrÚcision]. June 9. Phonographs, graphophones, &c.-Relates to diaphragms for phonographs, graphophones, &c. The diaphragm a is surrounded by a split indiarubber or other elastic tube or cord b, which is cemented or otherwise secured in the holder. Two tubes or cords may be placed one on each face of the diaphragm.
GB190213067D1902-06-091902-06-09Improvements in Phonographs, Graphophones and other Speech Reproducing Apparatus.
ExpiredGB190213067A
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