[Answer] What one piece of information was listed in the first telephone book?

Step 1 : Introduction to the question "What one piece of information was listed in the first telephone book?"

...Telephone books were once vital to contacting people and services. A far cry from the thick yellow phone books we know today, the first telephone “book” was just a single page long. Released in 1878, it contained just 50 names of people who owned telephones. To speak to the correct person, you simply spoke their name into the phone and an operator would make the connection.

Step 2 : Answer to the question "What one piece of information was listed in the first telephone book?"

Names:

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