Number Five Crossbar Switching System

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1Panel 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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Source URL: www.historyofphonephreaking.org

Language: English - Date: 2008-08-21 12:13:25
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