|
| US3981501 | 11 déc. 1974 | 21 sept. 1976 | | Retractible goal post |
| US4181309 | 26 août 1977 | 1 janv. 1980 | Kenneth W. Atkinson | Method and apparatus for golf practice and instruction |
| US4355811 | 28 août 1980 | 26 oct. 1982 | | Automatic golf ball teeing apparatus |
| US4815744 | 4 sept. 1987 | 28 mars 1989 | | Automatic golf ball tee assembly |
| US5133557 | 16 août 1991 | 28 juil. 1992 | | Golf practicing apparatus |
| US5292119 | 24 mars 1993 | 8 mars 1994 | | Pneumatically operated ball release ball delivery apparatus |
| US5348305 | 17 déc. 1992 | 20 sept. 1994 | | Golf ball teeing apparatus |
| US5351964 | 1 déc. 1993 | 4 oct. 1994 | WorldWide Golf Resources, Inc. | Golf ball teeing device |
| US5672124 | 22 nov. 1996 | 30 sept. 1997 | Quick Hit, Inc. | Automatic batting tee apparatus |
| US7018300 | 6 janv. 2004 | 28 mars 2006 | | Automatic golf ball teeing up device |
| US7603997 | 2 avr. 2007 | 20 oct. 2009 | Smart Parts, Inc. | Electrical control unit for paintball gun |
