(under the class definition) Subject matter wherein means are provided to regulate the operation of said transmission, and such means are actuated by electric or magnetic energy. [figure] [caption] A friction gear permanent magnetic entrainment means for rolling transmission of motion in combination with a magnetic-technical system having one magnetic circuit comprising at least two magnets and at least one operating air gap, including a frame being composed of symmetrically arranged permanent magnets and symmetrically arranged mild iron or steel parts, with the mild iron or steel parts arranged between analogous poles of the magnets forming central frontal surfaces drawn into the interior of the frame, which central frontal surfaces are opposing one another forming an operating air gap with opposite polarities in the direction of magnetizing.
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4, for electric or magnetic control of condition responsive ratio change.