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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 6078.2-1998 |
Centre drills--Part 2:Centre drills for centre holes with protecting chamfers--Type B--Dimensions 中心钻 第2部分:带护锥的中心钻 B型 型式和尺寸 |
China National Standards 2:Centre |
 English PDF |
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