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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 37199.1-2021 |
Plastics—Polybutene(PB) moulding and extrusion materials—Part 1：Designation system and basis for specifications 塑料 聚丁烯（PB）模塑和挤出材料 第1部分：命名系统和分类基础 |
China National Standards 1：Designation |
 English PDF |
| GB/T 25669.1-2010 |
Tooling system for NC boring and milling machine - Part 1：Designation 镗铣类数控机床用工具系统 第1部分：型号表示规则 |
China National Standards 1：Designation |
English PDF |
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