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A telephone operator manually connecting calls with cord pairs at a telephone switchboard
A telephone operator manually connecting calls with cord pairs at a telephone switchboard
A modern central office, equipped with voice communication and broadband data capabilities
A modern central office, equipped with voice communication and broadband data capabilities
Tivadar Puskás
Tivadar Puskás
1922 diagram of 1877 Boston exchange
1922 diagram of 1877 Boston exchange
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An early 20th century candlestick telephone used for a phone call
An early 20th century candlestick telephone used for a phone call
An early 21st century mobile phone being used for a phone call
An early 21st century mobile phone being used for a phone call
U.S. President Gerald Ford on the phone
U.S. President Gerald Ford on the phone