Events in telecommunications history

Events in telecommunications history

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AT aamp; T Archives ... line 5/1 955 PATENTS (Concerning telephone devices) Elisha Gray 1/1869 First telephone conceived 7/ 1 874 Bell Patent ... announcement system 1 0/1 952 Dictation recording trunks 1 0/1 954 MerlinAr 10/1983, 4/1987, 9/ 1987 System 75 4/1984, 9/1986.2/1989 System 25 7/1986 System 85 2/1987, 2/ 1989 SpiritAr 4/1987 System 2000 5/1988 DefinityAr 75/85 2/1989 Last manual 7/ 1990anbsp;...


Title:Events in telecommunications history
Author: AT & T Archives
Publisher: - 1992
ISBN-13:

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