Toll crossbar system arranged to complete connections from trunks from outward toll positions to toll lines for outward calls; from toll lines to trunks to local offices for terminating calls; from one toll line to another for calls switched through Philadelphia.
Philadelphia adopts automatic Toll switching
Bell Laboratories Rec
Bell Laboratories Record ; 22 , n 3
1943
4 pages
Aufsatz (Zeitschrift)
Englisch
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Automatic toll switching system
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