Demonstrating listening device, very similar to a telephone, used on board ships with submarine signaling apparatus

Demonstrating listening device, very similar to a telephone, used on board ships with submarine signaling apparatus. In: “Submarine Signaling,” Scientific American Supplement, No. 2071, pp. 168-170, Sept. 11, 1915.

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Author: NOAA

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Added On	18th October 2015
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