✦ LIBER ✦
Method and results of an experiment to measure the mechanical drilling speed and durability of the 6L-145-Ok bit in relation to drilling conditions and rock hardness
✍ Scribed by G. I. Rakhleev
- Publisher
- Springer
- Year
- 1967
- Tongue
- English
- Weight
- 529 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1573-8736
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