. The Bell System technical journal . O PRIMARY OUTLET• TOLL CENTER FUNDAMENTAL ROUTESOF GENERAL PLAN SUPPLEMENTARY DIRECTCIRCUIT GROUPS Fig. 22—Application of the toll switching plan to an operating area. ® REGIONAL CENTERO PRIMARY OUTLET• TOLL CENTER. FUNDAMENTAL ROUTESOF GENERAL PLAN SUPPLEMENTARY DIRECTCIRCUIT GROUPS

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1