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MATH PUZZLE: Can you replace...

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

Correct answers: 4206

The first user who solved this task is Donya Sayah30.

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Sandpaper

In 1834, the first U.S. invention of sandpaper was covered by four patents issued on this date to Isaac Fisher, Jr., of Springfield, Vt. These patents were titled "Coating Paper." (No X8246, -7)

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