Wikipedia Easy Search

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "Strowger switch" – news · newspapers · books · scholar · JSTOR (February 2008) (Learn how and when to remove this message)

Western Electric 7A Rotary, friction drive (Bird-cage), No. 7001 Line Finder. Note the driven bevel gear on the right-hand side; this type has a steady rotary motion and does not employ an electromagnet for stepping.

Bank of two-motion switches

The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics, it is also known as a step-by-step (SXS) switch.