Title:
Automated system and drilling rig for continuously and automatically pulling and running a drill-pipe string
United States Patent 3404741


Inventors:
Aldea, Gheorghe
Nicolau, Ioan
Dogaru, Leon
Dumitru, Ion
Application Number:
US33231063A
Publication Date:
10/08/1968
Filing Date:
12/20/1963
Assignee:
Ministerul, Ind Petrolui Chi SI.
Primary Class:
Other Classes:
166/77.53, 414/22.57
International Classes:
E21B19/20
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