| 1. | Rope thread extension steel bars for rock drilling
凿岩用波形螺纹连接钎杆 |
| 2. | Rock drilling equipment . hollow drill steels in bar form
凿岩钎杆用中空钢 |
| 3. | Rock drilling equipment - hollow drill steels in bar form
凿岩钎杆用中空钢 |
| 4. | Optimization of drilling and blasting parameters of taochong iron mine
桃冲铁矿凿岩爆破参数优化 |
| 5. | Drill bits with tapered connection for percussive wet rock drilling
凿岩.冲击湿式凿岩用的锥体钻头 |
| 6. | Hollow hexagonal drill rods with taperd connection for rock drilling
凿岩用锥体连接中空六角形钎杆 |
| 7. | Rock drilling ; flush drills ; drill rod profiles , shanks and tapers
凿岩.冲击钻.钻杆截面.钻柄和锥度 |
| 8. | Hollow hexagonal drill rods with tapered connection for rock drilling
凿岩用锥形连接中空六角形钎杆 |
| 9. | Carbide detachable bit for rock drilling
凿岩用硬质合金钎头 |
| 10. | Rod taper for detachable rock - bit
可卸式凿岩钎头用锥形钎杆 |
