4. Fire escape, ladder, or scaffold
  5. Pivotally connected ladders, mutually sustaining
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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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Fitting for joints of ladder sections

Fire escape – ladder – or scaffold – Pivotally connected ladders – mutually sustaining
Patent

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Triladder

Fire escape – ladder – or scaffold – Pivotally connected ladders – mutually sustaining
Patent

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Walking stepladder

Fire escape – ladder – or scaffold – Pivotally connected ladders – mutually sustaining
Patent

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