pdf SXS - Plant Training - NJB - 355 CDO - 1951 Popular
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SXS-Plant_Training_NJB_355_CDO_1950.pdf
Training book produced by a New Jersey Bell employee that contains schematics and sequence charts for circuits encountered in a 355 Community Dial Office (CDO). Scanned by Martin Harriss from an original supplied by Charlie Dunne.
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