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What is a Touch Tone Telephone? (with pictures)
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Bell Telephone Company eingeführt 1959 die Wählscheibe Telefone ersetzen die Taste Telefon. Das Telefon benutzt neu verfügbare Transistoren, um die viele Töne mit elektronischen Oszillatoren zu produzieren Stockfotografie - Alamy
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Das ist die Website der konservierten Töne
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Telefon – Wikipedia
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What is a Touch Tone Telephone? (with pictures)
Telephone handset, two-tone light brown and black, | Science Museum Group Collection
Telephones / Systems
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Übersicht der Hörtöne (Signaltöne) – bintec elmeg Knowledge Base
