|
2019
|
P/S
|
Machines and equipment for oil processing and refinement, namely, oil well pumping machines; oil ... |
|
2012
|
P/S
|
Oil exploitation and refining equipment; oil rigs; slurry
pumps for the petroleum industry; oil ... |
|
2011
|
Invention
|
Rotary lock block type drilling riser connector. A rotary lock block type drilling riser connecto... |
|
2008
|
P/S
|
Machines and equipment for oil processing and refinement;
oil drilling machines; sludge pumps sp... |
|
|
P/S
|
Mineworking machines, namely, dust collectors for mining, electrical industrial controls for conv... |
|
2007
|
Invention
|
Cooling device for interior and exterior surfaces of a mud pump liner. A cooling device for inter... |
