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Cuffie SIA - (DEPOSITATO). Italia ~1940 © IK3HIA, 2024. |
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SIA Headphones - SIA (DEPOSITED). Italy ~1940 SIA was an Italian company that produced telephone equipment, headphones and accessories. The earcups of the headphones were made of brown Bakelite while the headband was metal. Each earcup had two 125 Ohm coils connected in series. The two earcups connected in series brought the total impedance to 500 Ohm. © IK3HIA, 2024. |
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