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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 1149.12-2013 |
Internal combustion engines―Piston rings―Part 12: Half keystone rings made of steel 内燃机 活塞环 第12部分：楔形钢环 |
China National Standards rings―Part |
 English PDF |
| GB/T 1149.10-2013 |
Internal combustion engines-Piston rings―Part 10: Keystone rings made of steel 内燃机 活塞环 第10部分：梯形钢环 |
China National Standards rings―Part |
English PDF |
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