TUCoPS :: YIPL 1-20 :: yipl15.pdf

YIPL No.15 (December 1972-January 1973) High "E" is 2637 Hz, Sure Cure for Message Units, Build a "T" network for Fun & Profit, Destructory Assistance, 1973 Credit Card Code, British System Rigged for Free Calls, etc.
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