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

Black American patent

In 1896, a U.S. patent for a "Razor Stropping Device" was issued to black American inventor, Henry Grenon (No. 554,867). The invention combined a frame, a strop within the frame, travellers with horizontal movement along the frame, and a carrier mounted in the travellers to hold the razor blade. The device was designed to handle a razor while stropping it, and providing for the razor to automatically turn on its back when the direction of motion of the travellers is reversed.

The Wisdom of Yoda – a little late

The Wisdom of Yoda – a little late
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