Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6971458 | Drill bit | Petrus Cornelis Kriesels | 2005-12-06 |
| 6953098 | Hydraulic drill string accumulator | Petrus Cornelis Kriesels | 2005-10-11 |
DZ
Djurre Hans Zijsling
Overall (2005): #58,135 of 245,428Top 25%
2
Patents 2005