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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


In-Band Single-Frequency Signaling By A. WEAVER and N. A. NEWELL (Manuscript received June 7, 1954)
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Document Date: 2008-08-21 12:12:51

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File Size: 1,55 MB

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