4. Movable or removable closures
  5. Plural wings radiate from common pivot; i.e., revolving
  6. With speed regulator
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Operating and speed control mechanism for revolving doors

Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving – With speed regulator
Patent

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Operating apparatus for controlling the operation of a revolving

Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving – With speed regulator
Patent

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