Megaphone
Chamber's Twientieth Century Dictionary · 1908 · p. 64
meg′a-fōn, n. an appliance for making words audible—a form of speaking-trumpet.
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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)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
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