2,623,908 12/1952 Stoesser et al...................... 568/727 2,812,364 9/1953 Farnham et al. ... 568/727 3,221,061 11/1965 Grover et al. .. ... 568/727 3,326,986 6/1967 Dugan et al. ....... ... 568/727 4,962,163 10/1990 Hefner, Jr. et al. ... 525/463 5,159,030 10/1992 Hefner, Jr. .............. ... 525/502 5,208,306 5/1993 Hefner, Jr. .............. ... 526/256 5,218,062 6/1993 Earls et al. .............. ... 525/526 5,227,452 7/1993 Earls et al. ............................ 528/96 5,248,360 9/1993 Jones, Jr. et al. ....... ... 156/166 5,262,509 11/1993 Hefner, Jr. et al. .................. 528/96 5,264,502 11/1993 Hefner, Jr. et al. ... ... 525/529 5,266,660 1 1/1993 Hefner, Jr. et al. ... 525/481 5,268,434 12/1993 Hefner, Jr. et al. ... 525/529 ... 525/481 5,270,404 12/1993 Hefner, Jr. et al. ... 5,270,405 12/1993 Earls et al. .......................... 525/481