pdf Cortelco 50-500-105 I4 Mar89 - 2500-series Circuit Labels Popular
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Cortelco_50-500-105_I4_Mar89_2500_Series_Circuit_Labels.pdf
Single-line pushbutton dial desk telephones - Circuit Labels. Shows wiring diagrams for variations of 2500 and 2502 sets. Contributed by Steve Cichorsky.
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