4. Building units and construction elements
  5. Stair, ladder, scaffold, or similar support
  6. Element or attachment

William M. Foster

Inventor

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Ladder safety apparatus

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

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Ladder safety apparatus and method

Fire escape – ladder – or scaffold – Safety device for ground-supported ladder
Patent

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Shipboard point defense system and elements therefor

Ordnance – Rocket launching – Having tubular guide means
Reexamination Certificate

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Profile ID: LFUS-PAI-P-526254

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