pdf ID Codes for No. 4 and Crossbar Tandem Offices - Jan61 ocr r Popular

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ID Codes for No. 4 and Crossbar Tandem Offices - Jan61 ocr r

List of all No. 4 and Toll Xbar Tandems in the US, 1961. With ID codes used by the announcements. Contributed by Clint Gilliland.

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