Cornet acoustique (mars 1936)
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Cornet acoustique (mars 1936). La personne installée dans l'ouverture doit pouvoir entendre les sons émis à plusieurs kilomètres de distance. L'axe permet d'orienter le dispositif selon la zone d'émission. Office national des recherches scientifiques et industrielles et des inventions.
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Acoustic helmet photographed on March 31st, 1936
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Cornet acoustique (mars 1936). La personne installée dans l