Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4736403 | Telephone line tester | Malcolm Muir, Johan S. van der Laan | 1988-04-05 |
| 4691345 | Multifunction two line telephone system | Malcolm Muir, Johan S. van der Laan | 1987-09-01 |