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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 2821-2003 |
Gear--Symbols for geometrical data 齿轮几何要素代号 |
China National Standards Gear Symbols geometrical |
 English PDF |
| GB/T 16443-1996 |
Planar double-enveloping worm gearing geometrical data symbols 平面二次包络环面蜗杆传动几何要素代号 |
China National Standards Gear Symbols geometrical |
English PDF |
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