DZ 46-1987
Regulations on Quality Grading of Vertical Shaft Geological Core Drilling Rigs (English Version)
- Standard No.
- DZ 46-1987
- Language
- Chinese, Available in English version
- Release Date
- 1987
- Published By
- Professional Standard - Geology
- Latest
- DZ 46-1987
DZ 46-1987 history
- 1987 DZ 46-1987 Regulations on Quality Grading of Vertical Shaft Geological Core Drilling Rigs
