DIN EN ISO 340 E:2020 文件草案 输送带 实验室规模可燃性特性 要求和测试方法(ISO/DIS 340:2020) 德文版和英文版 prEN ISO 340:2020
Draft Document - Conveyor belts - Laboratory scale flammability characteristics - Requirements and test method (ISO/DIS 340:2020); German and English version prEN ISO 340:2020