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

2 points·by thro1·9 เดือนที่ผ่านมา·1 comments

rexresearch.com

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

http://www.rexresearch.com/johnson/1johnson.htm

1 comments

thro1·9 เดือนที่ผ่านมา

( https://patents.google.com/patent/US4877983A/en expired 2006, https://www.freepatentsonline.com/4877983.html )

Is that similar: https://news.ycombinator.com/item?id=45600132 ?

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