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Telephony / Signaling / Single-frequency signaling / Telephone exchange / Signal tone / Telephone / Multi-frequency signaling / Signalling System No. 7 / Relay / Electronic engineering / Technology / Electromagnetism
Date: 2008-08-21 12:12:51
Telephony
Signaling
Single-frequency signaling
Telephone exchange
Signal tone
Telephone
Multi-frequency signaling
Signalling System No. 7
Relay
Electronic engineering
Technology
Electromagnetism

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