pdf 502-503-103 i1 Reference 2563 2564 2568 Telephone Sets - Tl Popular
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502-503-103-i1-Reference-2563-2564-2568-Telephone-Sets_tl.pdf
Issue 1, June 1970. Info was previously in 502-525-123, 502-525-124 and 502-532-121. The 2568 is for 2- or 4-wire line circuits and 1A1, 1A2, or 6A KTS.
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