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These projects were all completed by volunteers of the Tetra Society of North America, a Canadian-based charity that invents devices to overcome barriers faced by people with disabilities.

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http://tetranation.org/video/?contest=video-detail&video_id=1524
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Author: admin
Title: Scooter Travel Ramp
Description: This travel ramp was custom built by Tetra Society of North America's volunteer engineers to enable a lady who gets about by scooter to negotiate inaccessible European sidewalks -- in this case, Paris, France.
Votes: 11
Views: 428