Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6960732 | Electric switch insertable into a control/display screen | Edgar Spiegel, Thomas Prowald | 2005-11-01 |
| 6727449 | Snap-in locking device for a multistage rotary switch | Edgar Spiegel, Thomas Prowald | 2004-04-27 |
| 6116151 | Pressure cooker | Bernhard Graziel, Arnold Thelen | 2000-09-12 |