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Scientific American, Vol. 40, No. 25 (1879) (1879)
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rding vided, doing away with expensive electrical conductors, which have baffled the ingenuity of inventors so far, and and dispensing with lamps or regulators at points where to the opinion of several cminent experts, it can be produced which must effectually block the progress of subdivision in… … © 1879 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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