gitter討論區:https://gitter.im/40823208/stage1-bg8
餅乾餵食機
https://kknews.cc/zh-tw/news/29nlyzy.html
https://www.u4get.com/2016/08/08/%E9%A3%9F%E5%98%A2%E5%8F%AF%E4%BB%A5%E6%89%93%E6%A9%9F%E5%94%94%E5%81%9C%E6%89%8B%EF%BC%9F-obi-%E8%87%AA%E5%8B%95%E9%A4%B5%E9%A3%9F%E6%A9%9F/
分球機
https://www.newmobilelife.com/2017/04/04/diy-coin-sorting-machine/
https://makerpro.cc/2019/11/diy-coin-classifier/
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