发明授权
US5022655A Jigsaw puzzle and technique 失效
拼图和技巧

Jigsaw puzzle and technique
摘要:
A jigsaw puzzle includes outer straight edge pieces forming a rectangular puzzle perimeter; a number of interior straight edge pieces suggesting an interior rectangle and increasing the proportion of the number of straight edge pieces to the total number of pieces in the puzzle; and a number of joiner pieces, some of the joiner pieces crossing the bounary of the interior polygon, and others of the joiner pieces at positions remote from the boundary.
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