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1936 - equipped for 45 sub., 5 toll sub. and 6 trunk lines - front view

TELEGRAPH SYSTEM UNIT NO.101

E&MP128.002

Telegraph

November 30, 1936

TTY Line Concentrating Unit No. 101 equipped for 45 sub., 5 toll sub. and 6 trunk lines - front view - trial installation at Norfolk, Va. - Spec. X-64296 Case 36871


BELL TELEPHONE QUARTERLY – OCTOBER, 1937 –“TWX”- - ITS GROWING TO THE NATION’S BUSINESS” – opp. Page 215 – “This Automatic Concentrator Acts as a Switching Medium …”


Original Caption by Science Service
©Bell Telephone



National Museum of American History

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