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Edison által saját kezűleg írt levél Puskáshoz. A levélben ír, a telefon külföldi szabadalmáról, a lemezes fonográffal végzett sikeres kísérletekről. Angol nyelvű
Weboldalunk működtetése során a felhasználói élmény növeléséhez illetve a jobb kiszolgálás érdekében oldalunk “cookie”-kat használ. RészletekÉrtem
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