4. Fluid reaction surfaces (i.e., impellers)
  5. Having positive means for impeller adjustment
  6. Motor bodily rotatable with impeller hub or shaft

Jr. Powell

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Blade angle control device for use in an axial flow fan the blad

Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Motor bodily rotatable with impeller hub or shaft
Patent

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Tail rotor

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Resilient bias or mount
Patent

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