In US Patent No. 190206 Wesley Gary described the combination of pushing and pulling. His devices embodies a permanent magnetic north and a permanent magnetic south pole with one end of a ferromagnetic core placed in the center, as a result the core moves neither up nor down. By creating an electromagnetic pole between the 2 permanent magnetic poles (what I refer to as) the effect of 3 points interacting arises. Said pole is now subjected to both push and pull but in complimentary direction. This while the electricity consumed reflects the difference between the push and pull.
] - http://www.google.com/patents?vid=USPAT190206
] - http://magnetmotor.go-here.nl/wesley-gary
] - http://magnetmotor.go-here.nl/text/3-point-interaction
] - http://forum.go-here.nl/viewtopic.php?t=24