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Scientific American, Vol. 90, No. 9 (1904) (1904)
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ing on the order of a telephone such a system of communication will soon be perfected. the upper end to a pneumatic piston, which is transmitter, from which wires are run to the pilot operated by compressed air either from the anchored The usefulness of the system in safeguarding ships house of the… … SYSTEM OF SUBMARINE SOUND © 1904 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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