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有免费演示版,查找专利(美国的),3-D结构(可自由旋转)。有用户名和密码后,可免费搜索,展示专利标题和摘要也是免费的,其他则要收费。(FREE searching of all classes of fulltext U.S. patent documents from 1971, with complete patent page images from 1994, and many JAVA-rotateable 3D chemical structures, from CAS)
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