4. Fluid reaction surfaces (i.e., impellers)
  5. Articulated, resiliently mounted or self-shifting impeller...
  6. Plural articulation

Hans Derschmidt

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Helicopter rotor head

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent

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Hingeless and bearingless multiblade rotor for rotary wing aircr

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Plural articulation
Patent

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Rotor without flapping hinges and without lead-lag hinges

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent

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