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Charles Georges Johan A Soolen
Henri Philippe Cowan
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8706. Soolen, C. G. J. A. v a n , and Cowan, H. P. April 6. Sound-box cases; diaphragms; tool arms and mounti n g s . - A phonograph sound-box is formed with a case 2, 3 having similarly-sized openings 9, 8 in each face. The case is made large to receive a large ivory diaphragm 1 situated so as to form a resonating-chamber on each side. The diaphragm may be thinned round the edge. The tool arm 10 is eccentrically pivoted to the case at 12.
GB191408706D1914-04-061914-04-06Improvements in or relating to Sound Boxes for Sound Reproducing Machines.
ExpiredGB191408706A
(en)