Honda Walking Assist Device Prototype
http://www.youtube.com/watch?v=pp4XUvgqkbU&feature=channel

Honda unveiled a prototype walking assist device that helps support the
bodyweight of the user.  The new walking assist device reduces the load on
leg muscles and joints in the hip, knees, and ankles by supporting a portion
of the person's bodyweight.

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Another Honda Walking Assist Device
http://www.youtube.com/watch?v=uZhyKtMSkdw&feature=related

See the Honda Walking Assist Device in action, an ASIMO-inspired technology
designed to aid in personal mobility. Find out more about Honda's walking
assistant at http://world.honda.com/news/2008/c080

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Toyota "Winglet"
http://www.youtube.com/watch?v=SfwwZu1GyUc&feature=channel

The Winglet, still currently under development, is a compact everyday
transport tool that is easy to operate and allows users to expand their range
of mobility.

http://www.carbodydesign.com/archive/2008/08/06-toyota-winglet-robots/

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Muscle Suits
http://www.youtube.com/watch?v=jEeuIKV9nn0&feature=channel

Hiroshi Kobayashi's research lab in the Department of Human Engineering at
the University of Tokyo is currently developing a "muscle suit" system that
uses pressurized air rubber tubes to assist in raising the arm. The device
maintains alignment on any arm regardless of its expansion and contraction.