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Telephone - Siemens W48 Wandapparat 1934 - ringing - USA standard 3.
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Telephone - Siemens W48 Wandapparat 1934 - ringing - USA standard 1.
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Telephone - Siemens W48 Wandapparat 1934 - ringing once 3.
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Telephone - Siemens W48 Wandapparat 1934 - long ringing - generated with 90 Hz signal.
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Telephone - Siemens W48 Wandapparat 1934 - long ringing - generated with 25 Hz signal.
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Telephone - Siemens W48 Wandapparat 1934 - long ringing - generated with 20 Hz signal.
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Telephone - Siemens W48 Wandapparat 1934 - ringing - European standard 3.
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Telephone - Siemens W48 Wandapparat 1934 - ringing - Australian standard 3.
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Telephone - Siemens W48 (1948) - ringing - USA standard 3.
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Telephone - Siemens W48 (1948) - ringing - USA standard 2.
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Telephone - Siemens W48 (1948) - ringing - USA standard 1.
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Telephone - Siemens W48 (1948) - ringing once 3.
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Telephone - Siemens W48 (1948) - ringing once 2.
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