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Folder 950 - 993 Division (8 Digits Series)

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Folder 950 Division (8 Digits Series)

Folder 971 Division (8 Digits Series)

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Folder 991 Division (8 Digits Series)

Folder 993 Division (8 Digits Series)

Documents

pdf 951-920-100 i1 Sep63 - Touch-Tone Calling

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951-920-100_i1_Sep63_Touch_Tone_Calling_tci_ocr.pdf

951-920-100 i1 Sep63 - Touch-Tone Calling

27 pages. Early description of touch-tone calling. Methods of partial conversion and complete conversion to use tone signals in existing mechanical exchanges. Contributed by the Connections Museum.

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