SummaryA 3D model of U.S. Pat. No. 2,454,693. Cutting edge 1948 portable-chess board technology from the original Thingiverse—the U.S. PTO.
"This invention concerns improvements in or relating to board or the like games which are played with pieces movable to predetermined positions upon the board."
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U.S. Pat. No. 2,454,693
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