On This Day in Telephone History June 16TH 1950 AT&T’s redesigned perforated tape relay equipment became the most extensive state teletypewriter system used for law enforcement in the California Department of Justice teletypewriter network.

On This Day in Telephone History June 16TH 1950

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On This Day in Telephone History June 16TH 1950 AT&T’s redesigned Perforated Tape Relay Equipment became the most extensive state teletypewriter system used for law enforcement in the California Department of Justice teletypewriter network.