pdf NE SK-1 Key Telephone System, 564, 565 and 2565 sets P0523328 I1 Popular

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NE SK-1 Key Telephone System, 564, 565 and 2565 sets  P0523328 I1
Issue 1, April 1973.  Wiring diagrams and connections for NE564, NE565 and NE2565-type sets.  Contributed by Louis Maffei.

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