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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 20144-2016 |
Barrel thread for lampholders with shade holder ring 带灯罩环的灯座用筒形螺纹 |
China National Standards Barrel thread lampholders |
 English PDF |
| GB/T 20144-2006 |
Barrel thread for E14 and E27 lampholders with shade holder ring 带灯罩环的E14和E27灯座用筒形螺纹 |
China National Standards Barrel thread lampholders |
English PDF |
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