|
US3338302A
|
Control system for sub-sea apparatus |
Expired / Lapsed
|
1964-08-24 |
1967-08-29 |
2 |
Details
|
|
US2676660A
|
Corrosion prevention of offshore well tubing |
Expired / Lapsed
|
1950-02-24 |
1954-04-27 |
0 |
Details
|
|
US2620890A
|
Seismic prospecting |
Expired / Lapsed
|
1947-12-01 |
1952-12-09 |
0 |
Details
|
|
US2323128A
|
Method and apparatus for determining liquid level |
Expired / Lapsed
|
1941-09-10 |
1943-06-29 |
0 |
Details
|