Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868435 | Single phase synchronous motor vibration apparatus | Hugo Schemmann, Romuald L. Bukoschek | 1989-09-19 |
| 4812691 | Device for improving the stability of rotation of the rotor of a single-phase synchronous motor | Leo Bertram, Hugo Schemmann | 1989-03-14 |