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River turbine

Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use...
Reexamination Certificate

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River turbine

Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use...
Reexamination Certificate

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Rotocraft rotor with folding blades and deicing electrical...

Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use... – Member movement in rotation plane
Reexamination Certificate

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Rotor construction for windmill

Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use...
Patent

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Rotor for passively stable helicopter

Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use...
Reexamination Certificate

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Rotor with folding blades, for the rotary wings of an aircraft

Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use... – Member movement in rotation plane
Reexamination Certificate

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Rotor, especially for rotary wing aircraft

Fluid reaction surfaces (i.e. – impellers) – Working member foldable – pivotable or collapsible to non-use... – Member movement in rotation plane
Patent

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