3 ms·

Howard Johnson, Permanent Magnet Motor, 1985, (patent expired 2006)

2 points by thro1 1y ago

thro1 1y ago
( https://patents.google.com/patent/US4877983A/en https://patents.google.com/patent/US4877983A/en expired 2006, https://www.freepatentsonline.com/4877983.html https://www.freepatentsonline.com/4877983.html ) Is that similar: https://news.ycombinator.com/item?id=45600132 https://news.ycombinator.com/item?id=45600132 ?