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The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. ... Strowger's patent [11] ...
Almon Brown Strowger (/ ˈ s t r oʊ dʒ ər /; February 11, 1839 – May 26, 1902) was an American inventor who gave his name to the Strowger switch, an electromechanical telephone exchange technology that his invention and patent inspired.
In 1889, Almon Strowger, of Kansas City, Missouri, was inspired by the idea of manufacturing automatic telephone exchanges that would not require switchboard operators. He founded the Strowger Automatic Telephone Exchange Company in 1891, which held the first patents for the automatic telephone exchange. In 1901, with the construction of a new ...
Almon Brown Strowger was the first to file a patent for a rotary dial on December 21, 1891, which was awarded on November 29, 1892, as U.S. patent 486,909. [ 4 ] [ 5 ] The early rotary dials used lugs on a finger plate instead of holes, and did not produce a linear sequence of pulses, but interrupted two independent circuits for control of ...
2 November 1889: A.G. Smith patents a telegraph switch which provides for trunks between groups of selectors allowing for the first time, fewer trunks than there are lines, and automatic selection of an idle trunk. 10 March 1891: Almon Strowger patents the Strowger switch the first Automatic telephone exchange.
Strowger Automatic Toll Ticketing (SATT); relay and type 45 rotary switch mechanics Strowger Step-by-Step (Strowger patents were exclusively licensed to the Automatic Electric Company). TSPS (Traffic Service Position System, obsolete system for operator handled LD calls.)
It can step on one axis (called a uniselector), or on two axes (a Strowger switch). As the first automated telephone switch using electromagnets and hat pins, stepping switches were invented by Almon Brown Strowger in 1888. Strowger filed his patent application on March 12, 1889, and it was issued on March 10, 1891. [273] 1888 Revolving door
The second fundamental Bell patent for telephones expired on January 30, 1894, which provided an opportunity for independent companies to provide telephone services, although some had been established before that date. The Strowger Automatic Telephone Exchange company had been formed on October 30, 1891.