Megaphone
An Illustrated Dictionary of Medicine, Biology and Allied Sciences · 1907 · p. 27
An instrument used for a isting the hearing of the deaf, by means of large reflectors of the sound-waves.
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The American Dictionary and Cyclopedia (1910)
Jack's Reference Book for Home and Office : An Encyclopaedia of General Information: English Dictionary (1909)
Chamber's Twientieth Century Dictionary (1908)
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