| Number | Name | Date | Kind |
|---|---|---|---|
| D153865 | Edelstone et al. | May 1949 | |
| D159897 | Edelstone et al. | Aug 1950 | |
| D179665 | Sykes | Feb 1957 | |
| D244702 | Montambo | Jun 1977 | |
| D279035 | Braswell | May 1985 | |
| D290298 | Sinclair | Jun 1987 | |
| D309198 | Macramalla | Jul 1990 | |
| D318146 | Fitzgerald | Jul 1991 | |
| 1649718 | McMullen | Nov 1927 |
| Entry |
|---|
| BRK Electronics product catalog CM759, p. 14, 1994. |
| BRK Brands product catalog CM760, pp. 6-7, 1995. |
| Pittway Corporation product catalog CM501, 3 pages, 1990. |