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Find number abc

If 5ac8b - bab74 = a0708 find number abc. Multiple solutions may exist.

Correct answers: 0

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What's white and if it fell ou...

What's white and if it fell out of a tree would kill you?
A fridge.

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African-American invention

In 1899, "Life Saving Guards for Street Cars" were patented by the black American inventor, J.H. Robinson (No, 623,929), who the previous month was issued a patent for life saving guards for locomotives (14 Mar 1899, No. 621,143).

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