Showing 1–4 of 4 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Johannes Cornelius Antonius Martens | — | 1 |
| 1 | Johannes Wilhelmus Henricus van Rijzingen | Varco I/P | 1 |
| 1 | Johannes M. De Bont | — | 1 |
| 1 | Alfred van Eck | Keystone International | 1 |
4 patents · 4 inventors
Ranked #7,257 of 22,654 cities Top 35%
Showing 1–4 of 4 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Johannes Cornelius Antonius Martens | — | 1 |
| 1 | Johannes Wilhelmus Henricus van Rijzingen | Varco I/P | 1 |
| 1 | Johannes M. De Bont | — | 1 |
| 1 | Alfred van Eck | Keystone International | 1 |