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What is the interference lock offset of a LEGO stud/hole such that it fits snugly into another piece? (i.e. What are the snap mechanism dimensions?) - Quora
Lego Specifications | Orionrobots - Building Robots Has Never Been So Easy
Why does LEGO have competitors such as Mega Bloks, who have not been taken out of business due to legal repercussions of manufacturing particularly similar toys? - Quora