pdf ID Codes for No. 4 and Crossbar Tandem Offices - Jan61 ocr r Popular
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ID_Codes_No4_and_Xbar_Tandem_Offices_Jan61_ocr_r.pdf
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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