4. Fire escape, ladder, or scaffold
  5. Ladder
  6. Independent support for rung

William H. Frank

Inventor

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Ladder and method of construction therefor

Fire escape – ladder – or scaffold – Ladder – Independent support for rung
Patent

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Rung lock and latch assembly for an extension ladder

Fire escape – ladder – or scaffold – Ladder – Extension
Patent

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Step signal

Fire escape – ladder – or scaffold – With indicator – signal or alarm
Reexamination Certificate

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Profile ID: LFUS-PAI-P-511754

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