A torque/force transfer apparatus which includes an annular ring having tein permanent first magnets side by side about the interior of the ring. The first magnets are arranged so as to alternate in polar orientation to present an inside circumference of alternating north and south magnetic poles. A...http://www.google.com/patents/US5569111?utm_source=gb-gplus-sharePatent US5569111 - Permanent magnet torque/force transfer apparatus
