Garaventa Inclined Platform Lifts 

Garaventa Inclined Platform Lifts are available for straight or curved staircases. They feature two models, one for curved staircases and the other for straight staircases. Both feature 550lbs capacity. Headoffices are located in Surrey, Canada.
They use a dealer network for their distribution

Garaventa X3 Inclined Platform Lifts are made for residential straight staircases. They feature 550lbs capacity and are also available for light commercial applications 

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Garaventa Artira Inclined Platform Lift is mostly used in commercial settings but also residential and can be custom made for curved staircases. Also available for outdoor applications

Garaventa Artira curved inclined platfor