4. Movable or removable closures
  5. Treadle or impact initiated operator
  6. Switch in approach to closure

Chikura Kogyo Kabushiki Kaisha

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Automatic door operator for swing doors

Movable or removable closures – Treadle or impact initiated operator – Switch in approach to closure
Patent

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Door swinging device for automatically swinging doors

Movable or removable closures – With operator for movably mounted closure – Operating lever or link and closure swing about parallel axes
Patent

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