sterilné Náhľad badminton erfinder mikrofon 1878 bez zápachu confini bystrý
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Kohlenstoff-Mikrofon, erfunden im Jahre 1878 von David Edward Hughes (1831-1900), englischer Erfinder. Von R. Wormell "Strom in den Dienst der Man'London, 1890. Gravur Stockfotografie - Alamy