4. Electricity: motive power systems
  5. Positional servo systems
  6. With particular 'error-detecting' means

The Cheney Company

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Apparatus and method for controlling an elevator

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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Electrical control system for stairway wheelchair lift

Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
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Stairway chairlift mechanism

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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Stairway lift chair

Furnishings – Furniture – freestanding support – or frame therefor – Seating unit
Patent

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Stairway wheelchair lift

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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