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

R. D. Werner Co., Inc.

Corporate Assignee

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Apparatus and methods for making rail-to-rung joints for ladders

Metal working – Method of mechanical manufacture – Assembling or joining
Patent

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Ceiling ladder

Fire escape – ladder – or scaffold – Door and ladder – Door operates ladder
Patent

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Cover for tops of ladders

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

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Extendable support

Fire escape – ladder – or scaffold – Platform – Relatively movable sections
Patent

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Extension trestle ladder

Fire escape – ladder – or scaffold – Pivotally connected ladders – mutually sustaining – Central upright ladder section supported therebetween
Patent

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Profile ID: LFUS-PAI-P-532071

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