Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860344 | Circuit arrangement for telecommunications switching systems, particularly telephone switching systems, etc. | Klaus Brandmaier, Siegfried Pohl | 1989-08-22 |
| 4811014 | Circuit arrangement for telecommunications systems, particularly telephone switching systems, comprising information interrogating devices cyclically driving inquiry locations | — | 1989-03-07 |