Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841568 | Circuit arrangement for a telephone station with earth connection to the central supply device | — | 1989-06-20 |
| 4809322 | Circuit arrangement for a telephone station with ground connection | — | 1989-02-28 |
| 4727571 | Circuit for surge voltage protection in electronic telephone stations | Alfred Brandstetter | 1988-02-23 |