A de-rotation system includes a first ring gear defined about an axis of rotation, a second ring gear defined about the axis of rotation and a gear set in meshing engagement with the first ring gear and the second ring gear to control a position of a housing about the axis of rotation.

 
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< Low voltage device for the generation of plasma discharge to operate a supersonic or hypersonic apparatus

> Passenger seat unit, in particular for commercial aircraft

> Ornithopter having a wing structure and a mechanism for imparting realistic, bird-like motion thereto

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