4. Fluid reaction surfaces (i.e., impellers)
  5. Articulated, resiliently mounted or self-shifting impeller...
  6. Sectional, staged or nonrigid working member

Robert H. Blackwell, Jr.

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Helicopter blade and rotor

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Sectional – staged or nonrigid working member
Patent

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Rotor blade for a high speed rotary-wing aircraft

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1979270

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