|
| US4863059 | 10 juin 1988 | 5 sept. 1989 | Christy Concrete Products, Inc. | Utility box construction and ring therefor |
| US5205592 | 24 juin 1991 | 27 avr. 1993 | Double Containment Systems | Underground containment tank and piping assembly |
| USD332416 | 25 mai 1990 | 12 janv. 1993 | American Meter Company | Meter set enclosure |
| USD366434 | 17 oct. 1994 | 23 janv. 1996 | General Electric Company | Electronic power meter and display |
