1334 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1954 



Fig. 1 — Points reached via Detroit CAMA at cutover in Dec, 1953. 



intertoU trunks and complete theraito other intertoll trunks or to local 

 central offices. In many situations, it provides more efficient trunking 

 facilities between central offices than do direct trunks and connects to- 

 gether offices with different signaling systems. Since the present crossbar 

 tandem offices have in themselves no means for recording billing data, 

 their use has been restricted to operator dialing, to customer dialing of 



