Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4929126 | Method for installing a screen of flexible material in the soil | Bastiaan G. Steenbergen, Willem De Waard | 1990-05-29 |
| 4720212 | Method and appliance for laying a sheet of material in the ground | Bastiaan G. Steenbergen | 1988-01-19 |