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  2. Caster - Wikipedia

    en.wikipedia.org/wiki/Caster

    Basic swivel casters were in evidence in Charles Darwin's famous "office chair" as early as the 1840s. Additionally, a swivel caster typically must include a small amount of offset distance between the center axis of the vertical shaft and the center axis of the caster wheel.

  3. Office chair - Wikipedia

    en.wikipedia.org/wiki/Office_chair

    An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It is usually a swivel chair , with a set of wheels for mobility and adjustable height. Modern office chairs typically use a single, distinctive load bearing leg (often called a gas lift ), which is positioned underneath the chair seat.

  4. Swivel chair - Wikipedia

    en.wikipedia.org/wiki/Swivel_chair

    Office swivel chairs, like computer chairs, usually incorporate a gas lift to adjust the height of the seat, but not usually large (e.g. recliner) swiveling armchairs. A draughtsman 's chair is a swivel chair without wheels that is usually taller than an 'office chair' for use in front of a drawing board .

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  6. Timeline of United States inventions (before 1890) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    1776 Swivel chair. A swivel or revolving chair is a chair with a single central leg that allows the seat to spin around. Swivel chairs can have wheels on the base allowing the user to glide the chair around their work area without getting up. This type of chair is common in modern offices and is often also referred to as an office chair.

  7. Wheelchair - Wikipedia

    en.wikipedia.org/wiki/Wheelchair

    Folding chair and stackable rigid chairs for visitors in NÄL hospital, Sweden. A self-propelled manual wheelchair incorporates a frame, seat, one or two footplates (footrests), and four wheels: usually two caster wheels at the front and two large wheels at the back. There will generally also be a separate seat cushion.

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