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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		Add to Reading List Source URL: www.historyofphonephreaking.org Download Document from Source Website File Size: 4,32 MB Share Document on Facebook

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