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Telephone switchboard
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A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telep
PBX switchboard, 1975
PBX switchboard, 1975
Telephone operator, c. 1900
Telephone operator, c. 1900
A large Bell System international switchboard in 1943
A large Bell System international switchboard in 1943
U.S. Air Force operator works a switchboard in the underground command post at Strategic Air Command headquarters, Offutt Air Force Base, Nebraska in
U.S. Air Force operator works a switchboard in the underground command post at Strategic Air Command headquarters, Offutt Air Force Base, Nebraska in 1967.
Almon Brown Strowger
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Almon Brown Strowger was an American inventor for whom the Strowger switch, an electromechanical telephone exchange technology, is named.
Telephone switchboard
…peak of its use in the 20th century before wider adoption of the electromechanical automatic telephone exchange. 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…
Almon Strowger
Almon Strowger