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https://casterbot.hatenablog.com/entry/2020/01/30/140457
https://casterbot.enjin.com/home/m/52767030/article/5025236
https://www.pr3-articles.com/Articles-of-2019/casters-wheels-are-used-numerous-applications
https://www.pr4-articles.com/Articles-of-2019/casters-wheels-are-used-numerous-applications
https://www.howto-tips.com/how-to-money-saving-tips-in-2019/casters-wheels-are-used-numerous-applications
https://www.voguemagazin.com/read-blog/2145
https://dailygram.com/index.php/blog/603011/what-is-the-omnidirectional-wheels-or-omni-wheels/
https://telegra.ph/What-is-the-Omnidirectional-Wheels-or-Omni-Wheels-01-30
https://www.authorea.com/users/294985/articles/423534-what-is-the-omnidirectional-wheels-or-omni-wheels
http://casterbot.bravesites.com/entries/general/what-is-the-omnidirectional-wheels-or-omni-wheels