Three inventors mentioned have developed prototype engines which (1) produce COP 1.0, and (2) apply a multivalued potential, pseudo-multivalued potential, or A-regauging, or both. The Johnson engine is already self-powering. Both the Takahashi and Kawai engines are readily convertible to self-powering embodiments.
source: http://www.explorepub.com/articles/beardon/overunity.html REGAUGING: Master Overunity Mechanism
new link: http://www.intalek.com/Index/Projects/Research/REGAUGINGMasterOverunityMechanism.htm