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

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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