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2 product ratings
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2 reviews
docron00713 Sep, 2016
great
lots of fun. can finally understand the planetary gear box concept. well made.
Verified purchase: Yes | Condition: new | Sold by: omnimodels
george.conway06 Sep, 2017
Learning Mechanical Engineering
A great teaching and self learning tool for young or old.
Verified purchase: Yes | Condition: new | Sold by: omnimodels