| Number | Name | Date | Kind |
|---|---|---|---|
| D. 31193 | Krantz | Jul 1899 | |
| D. 192920 | Beals | May 1962 | |
| D. 217251 | Kahn | Apr 1970 | |
| D. 261134 | Heritage | Oct 1981 | |
| D. 401224 | Mollenkopf et al. | Nov 1998 | |
| 5826385 | Dykstra et al. | Oct 1998 | |
| 5881500 | Latino et al. | Mar 1999 | |
| 5901513 | Mollenkpf et al. | May 1999 |
| Entry |
|---|
| Allied Electronics 900 Engineering Manual & Purchasing Guide, c. 1990: p. 366—Item Nos. UL2064 and UL2065. |