4. Conveyors: power-driven
  5. Conveyor or accessory therefor specialized to convey people
  6. By stairway having steps forming an endless member

D.R. Lackey

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Elevator system

Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent

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Escalator having yieldable primary and non-yieldable secondary t

Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people – By stairway having steps forming an endless member
Patent

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