German sound location system, 1917
HMAS Yarra (I) and HMAS Parramatta (I), the River-class torpedo-boat destroyers, 1910
HMAS Parramatta (I), a River-class torpedo-boat destroyer, 1910
HMAS Yarra (I), a River-class torpedo-boat destroyer, 1910
German sound location system, 1917
The horn warning system tested in the USA
SMS Kronprinz Wilhelm In Scapa Flow 1919
A German early warning system, 1917
Wurger

German sound location system, 1917

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