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Asklemmy@lemmy.ml · 21 小时前

What did you invent?

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What did you invent?

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Asklemmy@lemmy.ml · 21 小时前

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Contramuffin@lemmy.world
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A lock-and-key mechanism. Modeled and 3D printed a proof-of-concept, too. Was proud of it until I found out someone invented it 100 years ago
- OhVenus_Baby@lemmy.ml
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  😂 Damn… I feel that.

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