Is it legal to use an opinel locking system patent? What I see on USPTO is that the patent is expired, so I want to use it, does anyone know? : r/knives
Practical, portable, single-minded, beautiful -- Opinel is the Apple of knives | Cult of Mac
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Knife locks part 3 - European Blades
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Finished customizing my Opinel 8. Blade and locking mechanism are acid etched and stone washed. Handle is sanded so that it fits better in the hand and is covered with wood stain