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Panel switch / Dual-tone multi-frequency signaling / Direct distance dialing / Signalling System No. 7 / Multi-frequency signaling / Single-frequency signaling / Number Five Crossbar Switching System / Rotary dial / Telephone / Telephony / Telephone exchanges / Signaling
Date: 2008-08-21 12:13:25
Panel switch
Dual-tone multi-frequency signaling
Direct distance dialing
Signalling System No. 7
Multi-frequency signaling
Single-frequency signaling
Number Five Crossbar Switching System
Rotary dial
Telephone
Telephony
Telephone exchanges
Signaling

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