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Scientific American, Vol. 54, No. 5 (1886) (1886)
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pal char own cable, and acteristic of either of which this system is can be operat- of course the ed independ- double line of ently of the cables that run others, or all side by side may be worked through the at the same time. The trenches; while one of these ca- two cables of the same sec- bles is… … © 1886 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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