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@jwz ("j͕̠̦̪͕̓͛̊̾̄ͅw̧̧̳̪̘͊̋͗̾͢͠z̢̘̞͈̺̞̩̓̽̐̋͗̆̋̚͟͜") wrote:
Spectrum analysis of Young Lust. Telephone World: The telephone network at that time used multi-frequency (or MF) signalling almost exclusively when someone made a long distance call. These are similar to Touch-Tones, but use different frequencies and... https://jwz.org/b/yjr_