Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841451 | System for measuring the duration ratio of pulses of variable frequency | Bernd Rumpf | 1989-06-20 |
| 4821266 | Testable electronic device and method of testing such a device | Heinz F. Ohm | 1989-04-11 |