4. Fire escape, ladder, or scaffold
  5. Means maintaining platform level on angularly movable support
  6. Swingable support

Bertrand Poudrier

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Articulated boom jib assembly

Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent

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Self-locking hydraulic pivot device for interconnecting a suppor

Traversing hoists – Having horizontally swinging boom or bridge – And means to swing boom horizontally
Patent

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Profile ID: LFUS-PAI-P-1356465

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