Found 2 3D-models for “patents” across many websites

#windmill#prior art#restoration#History#innovation#materials#intellectual property#3-D printing materials#CatchTheWind#filament
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Windmill, 1884 #Catch the Wind

Windmill, 1884 #Catch the Wind

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3-D Printing Materials You Can't Patent

3-D Printing Materials You Can't Patent

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