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What represents the following ...

What represents the following text 7DOTW?

Correct answers: 49

The first user who solved this task is On On Lunarbasil.

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Naked Man

Q: What did the elephant say to the naked man?

A: "How do you drink water with that?"

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Railroad safety

In 1870, Thomas S. Hall of Stamford, Conn., received a patent for the first automatic electric block railroad signal system in the U.S. (No. 103,875). When a train entered a block of track, Hall's electromagnetic device automatically set a signal when the locomotive struck a lever fastened to the rail. The signal was set to danger until the train cleared the block. After Hall invented the device in 1867, it was tried out on the New York and Harlem Railroad.

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