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Show Sound Amplifier for Telephone. For the telephone user in a noisy office, a sound amplifier of compact and convenient form has been Introduced, Intro-duced, according to the Popular Mechanics Me-chanics Magazine. It Is particularly suited for the person who receives many Important toll calls, since in addition ad-dition to magnifying the vibrations, It excludes foreign noises. The device consists of a small resonator to which an adjustable branched ear tube, such ns Is employed with a stethoscope, Is attached. In use the receiver la placed on top of the amplifier. |