NF H35-101:1991
制瓶工业 玻璃瓶 静止液体用("verplast" 直径 29/21 的 3号口径)直经29mm(口部21mm)盖上有倾倒箍的玻璃瓶口 尺寸
Bottling industry. Glass bottles. Glass finish for pouring clip on cap finish of 29 (opening diameter 21 mm) for still liquids (so-called "verplast" diameter 29/21 no 3 for spout). Dimensions.