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What are the Different Parts of a Phone Number Called? — LinkedPhone
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Homebrew Telephone Exchange Keeps The Family In Touch, In The House And Beyond | Hackaday
In 1956 Today Was April Phones' Day | Hometown by Handlebar
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Garfield Telephone Exchange « Alameda Old House History
When Did NYC Lose Its Iconic Letter Telephone Exchanges? | New-York Historical Society
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When Chicago Phone Numbers Had Letters | WBEZ Chicago
