| Number | Name | Date | Kind |
|---|---|---|---|
| 3576118 | Doerrfeld | Apr 1971 | A |
| 3871198 | Miller | Mar 1975 | A |
| 4420954 | Hieronymi et al. | Dec 1983 | A |
| 4892338 | Weinerman et al. | Jan 1990 | A |
| 4951486 | Braun et al. | Aug 1990 | A |
| 4989907 | Edmonds et al. | Feb 1991 | A |
| 5439260 | Weinerman et al. | Aug 1995 | A |
| 5564295 | Weinerman et al. | Oct 1996 | A |
| 5586458 | Weinerman et al. | Dec 1996 | A |
| 5586795 | Sasaki | Dec 1996 | A |
| 5595076 | Weinerman | Jan 1997 | A |
| 5875948 | Sadler | Mar 1999 | A |
| 5884948 | Weinerman | Mar 1999 | A |
| 5941104 | Sadler | Aug 1999 | A |
| 5984383 | Parikh | Nov 1999 | A |
| Entry |
|---|
| Hansen Commercial & Industrial Hardware Catalogue, pp. 9 and 28. |