Drilling rotors and for oil and gas wells repair. Basis parameters and dimensions
NORM herausgegeben am 1.1.1980
Designation standards: GOST 4938-78
Note: UNGÜLTIG
Publication date standards: 1.1.1980
The number of pages: 6
Approximate weight : 18 g (0.04 lbs)
Country: Russian technical standard
Kategorie: Technische Normen GOST
Implemented changes and corrections:
Amd. 2.85
Amd. 11.86
Amd. 11.90