| Number | Date | Country | Kind |
|---|---|---|---|
| DM/014569 | Sep 1989 | IBX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2170174 | Wiegand | Aug 1939 | |
| 3272965 | Reichelt | Sep 1966 | |
| 3500016 | Karmazin | Mar 1970 |
| Number | Date | Country |
|---|---|---|
| 1196345 | Nov 1959 | FRX |
| Entry |
|---|
| Commodore Heaters Corporation Brochure, p. 4, Heating Element A top left side of page. |