DIN EN ISO 20957-9:2017 固定训练器械.第9部分:椭圆形训练器材的附加特殊安全要求和试验方法(ISO 20957-9-2016);德文版本EN ISO 20957-9-2016
Stationary training equipment - Part 9: Elliptical trainers, additional specific safety requirements and test methods (ISO 20957-9:2016); German version EN ISO 20957-9:2016