Duplicate link but in another language
From OHO - search engine for sustainable open hardware projects
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see <a target="_blank" rel="nofollow noreferrer noopener" class="external free" href="https://en.oho.wiki/wiki/Windmill_build_yourself_-_Magnet_applications_-_supermagnete">https://en.oho.wiki/wiki/Windmill_build_yourself_-_Magnet_applications_-_supermagnete</a>