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BASIC DESCRIPTION - Telephone-Telegrams
BASIC DESCRIPTION - Phonograms
IN DEPTH DESCRIPTION - Phonograms
AUTOMATIC DISTRIBUTION Part 1 -
POEEJ Volume 42 - October 1949.
AUTOMATIC
DISTRIBUTION Part 2 -
POEEJ Volume 42 - October 1950.
DEVELOPMENTS IN PHONOGRAM WORKING - POEEJ
Volume 26 - April 1933.
JUNCTION AN ROUTING
PHONOGRAM AND TELEPHONE-TELEGRAM WORKING -
An article from 1937
PHONOGRAM AT THE CTO
SWITCHBOARDS
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