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原帖由 大烟头 于 2011-4-1 17:35 发表
专利已经过期,不存在专利问题
http://www.calormen.com/TwistyPuzzles/twisty.htm
Patent Number: SU1232171 Popular Name: Russian Master Pyraminx Inventor(s): Alexsandr A. Ordynets Date Issued: May 2 ...
原帖由 大烟头 于 2011-4-1 17:35 发表
专利已经过期,不存在专利问题
http://www.calormen.com/TwistyPuzzles/twisty.htm
Patent Number: SU1232171 Popular Name: Russian Master Pyraminx Inventor(s): Alexsandr A. Ordynets Date Issued: May 2 ...
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