4. Fire escape, ladder, or scaffold
  5. Ladder with vertically moving platform or escape
  6. Ladder supports platform

Philip Hanthorn

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Combined counting board and abacus

Printing and office machinery – Typewriter or calculator – Calculator
Patent

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Portable lift with telescopic booms and load-carrying apparatus

Fire escape – ladder – or scaffold – Ladder with vertically moving platform or escape – Ladder supports platform
Patent

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Profile ID: LFUS-PAI-P-1055585

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