4. Horizontally supported planar surfaces
  5. Plural related horizontal surfaces
  6. Coplanar extension surface

Ronningen Research & Development Company

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Cross brace for a platform assembly

Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent

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Height or level adjusting device for platform assembly

Hydraulic and earth engineering – Marine structure or fabrication thereof – Dock
Patent

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Platform assembly and accessories therefor

Hydraulic and earth engineering – Marine structure or fabrication thereof – Dock
Patent

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Platform or similar article

Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent

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Platform support

Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent

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