Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873682 | Digital key telephone system | Paul J. Smelters, David Joseph Robertson, Ronald J. Maginley | 1989-10-10 |
GI
George F. Irwin
Overall (1989): #111,999 of 140,708Top 80%
1
Patents 1989