4. Fluid reaction surfaces (i.e., impellers)
  5. Specific blade structure
  6. Openwork

Steven B. Goldberg

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Stimulating feeding device for a child

Amusement devices: toys – Convertible from – or serving as diverse article – Including figure toy
Reexamination Certificate

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Vertical-axis wind turbine with a twisted blade configuration

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Openwork
Patent

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