Laboratory ware made from fused quartz and fused silica; straight bore stopcocks made from fused quartz Appareillage de laboratoire en quartz ou silice; robinets à passage direct en quartz
DIN 12542:1979 history
1979DIN 12542:1979-04 Laboratory ware made from fused quartz and fused silica; straight bore stopcocks made from fused quartz
1979DIN 12542:1979 Laboratory ware made from fused quartz and fused silica; straight bore stopcocks made from fused quartz