| Number | Name | Date | Kind |
|---|---|---|---|
| 2346483 | Goss | Apr 1944 | |
| 3060745 | Riley | Oct 1962 | |
| 3322380 | Affel et al. | May 1967 | |
| 4759216 | Carpenter et al. | Jul 1988 |
| Entry |
|---|
| Datcon Instrument Company, Inc., P.O. Box 128, East Peterburg, Pa. 17520; Heavy Duty Automotive Brochure, Cover Page; .COPYRGT.1992. |
| Howell Technical Bulletin; 3"-Diameter digital Indicators; Jun. 1966; cover page. |