Strowger switch

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.

"SXS" redirects here. For the flash memory standard, see SxS. For the Microsoft Windows SxS, see Side-by-side assembly. For the Side by Side all terrain vehicle, see Side by Side (UTV).
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