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Find number abc

If 62927 - ca97a = 4b954 find number abc. Multiple solutions may exist.

Correct answers: 2

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If pro is the opposite of con,

If pro is the opposite of con, what's the opposite of progress?
- Congress!

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Shutter patent

In 1883, black American inventor J. Cooper was issued a patent for his invention, "Shutter and Fastening" (No. 276,563). In the next few years, he also patented elevator devices.

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