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在技术革新和技术革命运动中,我队提出各种类型钻头计70多种,已制成30余种,经过反复试验,已经定型有9种,其中合金钻头8种,钢粒钻头1种。
In the process of technological innovation and technological revolution, our team made more than 70 kinds of drill bits of various types and made more than 30 kinds. After repeated tests, there have been 9 kinds of drill bits, of which 8 are alloy drills and 1 are steel drill bits.