Rotary switch

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51	Early Work on Dial Telephone Systems R. B. HILL Add to Reading List Source URL: www.historyofphonephreaking.org Language: English - Date: 2011-02-01 18:13:01 Rotary dial Strowger switch Telephone Phreaking Director telephone system Panel switch Telephony Telephone exchanges Technology
52	PDF Document Add to Reading List Source URL: www.historyofphonephreaking.org Language: English - 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