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Find number abc

If 614cb - 54c44 = a1a6 find number abc. Multiple solutions may exist.

Correct answers: 3

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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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