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Scientific American, Vol. 69, No. 19 (1893) (1893)

leaf 15

An illustration from Scientific American, Vol. 69, No. 19 (1893), 1893, leaf 15
|NovEMBER 4, 1893. … $6.00 K 0 D A K $ $100.00 be used to produce the electrical action make. By G.M. Hopkin: ructed with motor devised and const on which the first patent rests. The third TO a battery, d from claim is for the use in such instruments of a diaphragm, made of a plate of iron lathe or any macht \\ith 11…

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