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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 277

The first user who solved this task is Donya Sayah30.

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Street sweepers

In 1896, black American inventor C.B. Brooks was issued a U.S. patent for street sweepers (No. 560,154). He was issued an earlier patent for street sweepers on 17 Mar of the same year (No. 556,711). Brooks also held a patent for a punch issued 31 Oct 1893 (No. 507,672).

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