Electromechanical transducers and wave filters, by Warren P. Mason ... Mason, Warren P. (Warren Perry), 1900- Electric circuits. Electric filters. Sound-waves. Electro-acoustics. TK3206 .M34 537.12 MAE New York, D. Van Nostrand company, inc., 1942. 1942. 1942 Text xii, 333 p. eng