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Diaphragms For Electromechanical Transducers
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Abstract
"A PERFECT HARMONY", which essentially comprises two outer pieces welded together, which fasten by means of a reed comb with reeds and a trumpet or sound output speaker mounted on the back of the set formed by the outer pieces, trumpet that has movement sliding by a ways or grooves made in said side pieces. (Machine-translation by Google Translate, not legally binding)