Todas estas fotos muestran diversos aparatos auditivos desarrollados por el Ejercito de Holanda, como parte de sus sistemas de defensa aerea entre la primera y segunda Guerra Mundial.
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: www.gabrielacordon@blogspot.com Personal stories about running an art school in rural Guatemala
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[...] Acoustic listening devices [...]
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[...] detect incoming enemy planes and Zeppelins across the Channel, it seems the Dutch were looking at amplification on more personal format.. I’m not sure if the Dutch preserved with these explosions of ear trumpet oddities but the [...]