pdf 503-501-120 i8 Aug78 - 503B, 503C, 503CM and 513B sets Popular

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502-501-120_I8_Aug78_503_513.pdf

503-501-120 i8 Aug78 -  503B, 503C, 503CM and 513B sets

for Data-phone service. August 1978.  Includes wiring diagram.

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