A magnetically induced coupling and drive apparatus (10) useful, for instance, for conveying webs utilizes magnetically coupled first and second rotatable elements (20,32)and means for rotating one of the rotatable elements (20, 32) which causes the simultaneous synchronous rotation of the other rotatable...http://www.google.com.au/patents/US5861692?utm_source=gb-gplus-sharePatent US5861692 - Magnetically induced coupling and drive apparatus
