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Calculate the number 4491

NUMBERMANIA: Calculate the number 4491 using numbers [7, 5, 7, 4, 47, 946] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 0

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Forgot

I was going to do something, then i got distracted for 5 seconds and forgot.

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Telegraph ticker patent

In 1846, the first U.S. patent for a telegraph ticker that would print letters of the alphabet was issued to R.E. House of New York City (No. 4,464). It was able to print at the rate of 50 words a minute in Roman letters. It had first been publically exhibited in 1844 at the American Institute Fair in New York City. It was widely used for ten years, until replaced by improved versions.

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