Summary
The High Commission of the Directorate of Inventions is studying Jean Perrin's acoustic device designed for the French army to pinpoint enemy positions precisely by sound detection.
© Direction des Inventions, des études et des expériences techniques - Section de cinématographie technique de la direction des inventions - 1917
Perrin earphone
Reference
6670
Duration
00:02:50
Production year
1917
Versions
Original material
HD
16/9
BW
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