SES (1 янв 1936 г. – 31 дек 1936 г.)
Описание:
Research into electronic telephone exchanges began and was eventually perfected in the 1960's with the electronic switching system (SES).Добавлено на ленту времени:
Дата:
1 янв 1936 г.
31 дек 1936 г.
~ 12 months