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512-730-400_I4.pdf

512-730-400 I4 Sep79 - 4A Speakerphone - Connections
Issue 4, Sept. 1979. Covers 630-, 631-, 632-, 634-, 635-, 2630-, 2631-, 2632-, 2634-, and 2635-type telephone sets. Call Directors.  Wiring diagrams.

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