| Number | Name | Date | Kind |
|---|---|---|---|
| 2997802 | Robbins | Aug 1961 | |
| 3307755 | Lentz | Mar 1967 | |
| 3368297 | Lentz | Feb 1968 | |
| 3774333 | Reynolds | Nov 1973 | |
| 5138786 | Fischer | Aug 1992 | |
| 5271174 | Bentley | Dec 1993 | |
| 5548915 | Szarmach et al. | Aug 1996 |
| Number | Date | Country |
|---|---|---|
| 70800 | Mar 1950 | DKX |
| Entry |
|---|
| Universal Gunlock Industries, Gunloc Security Device, Feb. 1995, p. 18 of American Rifleman Jan./Feb. 1995. |