pdf 506-100-108, Manual Extension Station Service on Semi-public Coin Lines Popular
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506-100-108_I2_Jun77_ManualExtSvc_CoinLines.pdf
Issue 2, June 1977, Manual Extension Station Service on Semi-public Coin Lines Connected to Coin Telephone Sets. Includes Description, Installation, Connections and testing.
e.g. 500C modified per D-108405 or 554A modified per D-108406
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