Marble Counter for GBC by Nico71

http://technicbricks.blogspot.com/search/label/Builders%20(Nicolas;%20Nico71)

有趣的機械式計數器, 大家可以看看。

 

About CAVEDU 阿吉 - 雜工 (2521 Articles)

CAVEDU 教育團隊 打雜

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