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BELL SYSTEM TECHNICAL JOURNAL 



Fig. 29 — -Panel type dial tandem office in New York City. 



Fig. 30 — -Panel type dial tandem office. Arrangement of keyboard at tandem 

 positions. Incoming trunks appear as lamps and associated keys on upper sloping 

 part of keyshelf. Calls are completed by setting up the called office and called 

 number on keys on lower part of keyshelf. 



