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| US4270757 | 2 Abr 1979 | 2 Jun 1981 | Jokari/U.S., Inc. | Tethered ball game and apparatus | | US6334821 | 6 May 1998 | 1 Ene 2002 | | Tethered practice apparatus for a ball game | | US6454670 | 18 Nov 1997 | 24 Sep 2002 | | Swing practicing apparatus | | US6612943 | 20 Sep 2002 | 2 Sep 2003 | | Swing practicing apparatus | | USD351692 | 27 Jul 1992 | 18 Oct 1994 | | Pet tether |
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