Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4327281 | Aquarium immersion heater with dry operation prevention thermostatic switch | Erhard Boettger | 1982-04-27 |
| 4310822 | Temperature control device for aquarium heater | — | 1982-01-12 |