U.S. Pat. No. 2,454,693 3D Model | Mini3DBook

U.S. Pat. No. 2,454,693 3D model preview

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About this 3D model

A 3D model of U.S. Pat. No. 2,454,693. Cutting edge 1948 portable-chess board technology from the original Thingiverseâ€”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."

board chess expired games patent patent2print public domain