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Esp@cenet — Home page. GPI - Global Patent Index Complement your search strategies in Espacenet by using our advanced search tool GPI. Take a look and register for a two-month free trial. Espacenet: Intro Click here to watch Cooperative Patent Classification: Intro Click here to watch. Science Experiments You Can Do At Home or School. Compendium Institute. ArXiv.org e-Print archive. Free Online Course Materials | MIT OpenCourseWare. MacResearch | Online Community and Resource for Mac OS X in Scie. About Crocodile Clips.