(Q124849748)

English

first United States transcontinental phone line

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1st United States transcontinental phone line

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United States transcontinental phone line

1

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25 January 1915^Gregorian

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First United States transcontinental phone line in 1915.png
1,200 × 860; 1.15 MB

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first United States transcontinental telegraph line

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second United States transcontinental phone line

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described at URL

https://www.cnet.com/tech/mobile/at-t-makes-the-call-100-years-ago/

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https://www.hmdb.org/m.asp?m=226390

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https://www.pbs.org/transistor/background1/events/transcon.html

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https://www.wondersofworldengineering.com/transcontinental_telephone_line.html

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First United States transcontinental phone line

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commonswiki Category:First United States transcontinental phone line

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