Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884384 | Arrangement for laying concrete floors | Lennart Johansson | 1989-12-05 |
| 4838000 | Arrangement for improved ventilation and method of using the arrangement | — | 1989-06-13 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884384 | Arrangement for laying concrete floors | Lennart Johansson | 1989-12-05 |
| 4838000 | Arrangement for improved ventilation and method of using the arrangement | — | 1989-06-13 |