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Just the tip #9: Graphite powder and compass lead

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Xuất bản 08/08/2016
Almost didn't fit this one in under one minute! There's a few tips crammed into this. "Just the tip" playlist: https://www.youtube.com/playlist?list=PLI-bnnMeWUqwjjioPWROsKTYI990rsDfl
interesting tips geometry tricks mathematics compass powder toys shop garage lead puzzles Compass Invention graphite woodworking Graphite Color