| Number | Name | Date | Kind |
|---|---|---|---|
| 2017553 | Troiel | Oct 1935 | |
| 3908956 | Gates | Sep 1975 | |
| 4158452 | Gates | Jun 1979 | |
| 4304388 | Gates | Dec 1981 | |
| 4899978 | Gates | Feb 1990 | |
| 5110083 | Page | May 1992 |
| Entry |
|---|
| Gates & Sons, Inc., “Gates Cam-Lock Forming System,” Dec. 1993, Gates & Sons, Inc., Denver, Colorado, USA. |