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A comment on Making and Selling a Stair-Climbing Dolly. Parent comment

Re:Making and Selling a Stair-Climbing Dolly by Yoric on Wednesday December 26, 2018 @04:34PM (#18765135)
Yeah, I'm pretty sure I've seen this kind of products at least 10 years ago. I imagine there's a difference, but I don't quite see which one.
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