This International Standard is applicable to stair-climbing chairs and stair-climbing wheelchair carriers wherethe stair-climbing device climbs backwards up the stairs, with the occupant facing downstairs, and climbsforwards down the stairs with the occup
DS/ISO 7176-28:2013 history
2013DS/ISO 7176-28:2013 Wheelchairs - Part 28: Requirements and test methods for stair-climbing devices