© Direction des Inventions, des études et des expériences techniques - Section de cinématographie technique de la direction des inventions - 1917
Fonds Historique / CNRS Images
Reference
6670
Perrin earphone
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.
Duration
Production year
Définition
Color
Sound
Version(s)
Original material
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