200 - 289 Divisions - Switching Systems

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226 Division - Step-by-Step, Community Dial Office

226 Division - Step-by-Step, Community Dial Office ( 209 Files )

Equipment Common to More Than One Type Step-By-Step and Community Dial Office

227 Division - Gen'l & Testing Info

227 Division - Gen'l & Testing Info ( 21 Files )

General and Testing Information Applying to Intertoll Dialing, CAMA, AMA, ANI, "Touch-Tone" Calling, and Common Control Equipment Step-By-Step Systems


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