
Mining. Method of directional hydraulic fracturing of roof softening in coal mines
NORMA vydána dne 1.11.2020
Designation standards: GOST R 58869-2020
Publication date standards: 1.11.2020
The number of pages: 16
Approximate weight : 48 g (0.11 lbs)
Country: Russian technical standard
Kategorie: Technické normy GOST