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Motograph   Listen
noun
Motograph  n.  (Elec.) A device utilized in the making of a loud-speaking telephone, depending on the fact that the friction between a metallic point and a moving cylinder of moistened chalk, or a moving slip of paper, on which it rests is diminished by the passage of a current between the point and the moving surface. (obsolescent)






Collaborative International Dictionary of English 0.48







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