Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873894 | Balanced free-planet drive mechanism | Bennett W. Avery | 1989-10-17 |
WE
William K. Engel
Overall (1989): #44,401 of 140,708Top 35%
1
Patents 1989