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As a beginner Defense
Bashny.Net
Dutch personal locator 1930s.
Two horns system Bolling Field, USA, 1921goda.
Cheshskiy- people locator.
Russian anti-aircraft gunners with a device for listening to the sky.
French locator 1930.
Marine acoustic locator from France.
Emperor Hirohito checks "military pipe" in 1930.
Experiments J M Bacon 1898god.
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See also
Things were first developed during the First World War.
Technology First World War (Part One)
Photos of the First World War
Unknown facts from the life of famous writers! The madness and genius - are two sides of the same coin?
World on the photo. In the sky (45 photos)
Unusual ammunition of World War I (58 photos)
The First World War (35 photos)
Live photos of the First World War
Sergeant Stubby - heroic dog of World War I
Here in Hungary we struggled with the wave of suicides After the First World War
