pdf SD-69909-01 i8D1 Aug79 - 4A Speakerphone Popular

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SD-69909-01 i8D1 Aug79 - 4A Speakerphone

Full set of schematics for the type 4A speakerphone system, including connections to compatible phones.  SD-69909. See BSP 512-700-100. Contributed by Bruce Lane.

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