AT Volunteer Organization Tetra Society of North America

The Tetra Society of North America is a non-profit organization in Vancouver that recruits skilled volunteers to create customized assistive devices for people with physical disabilities in North America (not just Canada). Over the years, Tetra volunteers have completed thousands of assistive device projects, ranging in complexity from a door-opener fashioned from a coat hanger to a clock designed to display time as a bar graph.  http://www.tetrasociety.org/