Mandl, Matthew. creator text xx New York Macmillan [1953] 1953 monographic eng

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158 p. illus. 22 cm. The modern hearing aids // the new user // method of wear // the molded earpiece // care of hearing aid // battery care and storage // making minor repairs // electronic repair factors // servicing procedures and typical troubles // future trends // index // Hearing aids RF300 .M3 617.89 MAN 53006408 DLC 750815 20191025140900.0 6039956