pdf 4ESS - "Long Distance Superstar" Popular
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76mar_BTM_p4_LongDistanceSuperstar.pdf
Bell Telephone Magazine (BTM), March/April 1976, page 4.
No. 4 ESS, with its vast call capacity, inaugurates a new generation of electronic switching.
Provides historical dates: 1ESS (metropolitan): 1965, 2ESS (suburban): 1970, 3ESS (rural): 1976, 4ESS (long distance): 1976
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