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Adjustable work platform assembly

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Adjustable working platform construction

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Apparatus for facilitating the internal inspection and repair of

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Arrangement for the demolition of smokestacks

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Device for enabling access to a structure above ground level

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Reexamination Certificate

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Dismountable tower for interior maintenance of spherical tanks

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Expandable scaffold for hopper

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Foldable platform for raise drilling

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Founding ladder system

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Grave frame

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Manhole construction safety and work platform device

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Reexamination Certificate

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Methods and apparatus for inspecting and/or working inside of a

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Movable support mechanism for construction of elevator shafts an

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Movable support mechanism for construction of elevator shafts an

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Portable hammock assembly

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Reexamination Certificate

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Safety landing

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Safety scaffold for metal melting furnaces

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Scaffold

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Scaffold

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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Scaffold for the construction of round buildings of concrete or

Fire escape – ladder – or scaffold – Scaffold supported internally on shaft
Patent

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