The world's first phone book was just a single piece of cardboard
The first telephone directory was published in New Haven, Connecticut, in 1878 as a single piece of cardboard containing only fifty names rather than phone numbers.
The New Haven District Telephone Company issued the first telephone directory on February 21, 1878, just two years after the telephone was patented. This simple document listed fifty subscribers, including residential names and businesses like the local police station and post office.
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