bn:02210769n
Noun Concept
Categories: Telephone exchanges, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, History of telecommunications, All articles needing additional references
EN
telephone switchboard  cordboard  Manual exchange
EN
A telephone switchboard was a device used to connect circuits of telephones to establish telephone calls between users or other switchboards, throughout the 20th century. Wikipedia
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EN
A telephone switchboard was a device used to connect circuits of telephones to establish telephone calls between users or other switchboards, throughout the 20th century. Wikipedia
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