| Number | Name | Date | Kind |
|---|---|---|---|
| D118774 | Hammell et al. | Jan 1940 | |
| D155243 | Sundberg | Sep 1949 | |
| 1154412 | Kuhn et al. | Sep 1915 | |
| 1480456 | Mallen | Jan 1924 | |
| 2495513 | Doyle | Jan 1950 | |
| 3322946 | Cooper | May 1967 | |
| 3425655 | Cogdill | Feb 1969 | |
| 4191879 | Kerchner, Jr. | Mar 1980 | |
| 4664620 | Fendall et al. | May 1987 | |
| 4760243 | Tedioli | Jul 1988 | |
| 5381509 | Mills | Jan 1995 |
| Number | Date | Country |
|---|---|---|
| 235213 | Dec 1959 | AUX |
| Entry |
|---|
| Advertisement for Quartz Malular Heaters, published by Tansun-Quartzheat Division, Tunnel Road, Hill Top, West Bromwich, West Midlands B70 ORD, published at least as early as Sep. 10, 1993. |