Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809886 | Apparatus for controlling a flow of granular material | Wiecher Derk Evert Steenge, Andrew M. Scott | 1989-03-07 |
HD
Hendrik A. Dirkse
Overall (1989): #107,097 of 140,708Top 80%
1
Patents 1989