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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.
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.
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 ...
On March 10, 1891, Almon Brown Strowger, an undertaker in Kansas City, Missouri, patented the stepping switch, a device which led to the automation of telephone circuit switching. While there were many extensions and adaptations of this initial patent, the one best known consists of 10 levels or banks, each having 10 contacts arranged in a ...
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 ...
Strowger switch, automatic telephone exchange equipment Strowger Automatic Telephone Exchange Company , the company that manufactured Strowger switches Almon Brown Strowger (1839–1902), who invented the principle of the Strowger switch in 1888
The automatic exchange, invented by Almon Strowger in 1888, has replaced most switchboards in central telephone exchanges around the world. Nevertheless, many manual branch exchanges remained operational into the second half of the 20th century in many enterprises. Some establishments, such as the White House, still operate a switchboard.
The director telephone system was a development of the Strowger or step-by-step (SXS) switching system used in London and five other large cities in the UK from the 1920s to the 1980s. A large proportion (c. 70% to 80%) of telephone traffic in large metropolitan areas is outgoing traffic, and it is distributed over many exchanges.