Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843875 | Procedure for measuring the rate of penetration of a drill bit | — | 1989-07-04 |
YK
Yves Kerbart
Overall (1989): #39,090 of 140,708Top 30%
1
Patents 1989