Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4798991 | Surface-gap spark plug for internal combustion engines | Walter Benedikt, Gerhard Heess, Werner Herden, Karl-Hermann Friese, Jurgen Schmatz +1 more | 1989-01-17 |
HR
Helmut Reum
Overall (1989): #106,290 of 140,708Top 80%
1
Patents 1989