(under subclass 905) Device wherein the runner's* axis of rotation is generally parallel to the force of gravity acting on the working fluid*.
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4.2, for a rotary pump* or motor* with means for controlling casing* or flow guiding means in response to natural fluid current force, which pump or motor has a vertical runner axis.
4.4, for a rotary pump* or motor* with means for controlling casing* or flow guiding means in response to natural fluid current direction, which pump or motor has a vertical runner axis.
