Energy transfer machine
 An energy transfer machine including a stator ring carried in a casing forming a toroidal fluid path between a fluid inlet and a fluid outlet. A rotor has a blade cascade coacting with fluid in the path to transfer energy therebetween. Apparatus and methods are disclosed for controllably unloading the energy exchange between the rotor and the fluid. 
The Garrett Corporation
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Hans Joe L. James H.
Egli Byrne Nancarrow