Rotary system

Western Electric friction drive Line Finder (No. 7001 type)

The Rotary Machine Switching System, or most commonly known as the Rotary System, was a type of automatic telephone exchange manufactured and used primarily in Europe from the 1910s. Formally named the No. 7-A Machine Switching System, it was developed in Belgium by International Western Electric, a subsidiary of American Telephone and Telegraph (AT&T), at the same time when AT&T's American engineering division, Western Electric, was developing the Panel switch in the United States.

单词	Rotary system
释义	Rotary system 英语百科 Rotary system The Rotary Machine Switching System, or most commonly known as the Rotary System, was a type of automatic telephone exchange manufactured and used primarily in Europe from the 1910s. Formally named the No. 7-A Machine Switching System, it was developed in Belgium by International Western Electric, a subsidiary of American Telephone and Telegraph (AT&T), at the same time when AT&T's American engineering division, Western Electric, was developing the Panel switch in the United States.
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