Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4939319 | Step selector for a stepped transformer | — | 1990-07-03 |
| 4935586 | Cylindrical step selector for stepped transformers | Leo Pillmeier | 1990-06-19 |
| 4931599 | Step selector for a stepped transformer | — | 1990-06-05 |