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D393672 | Clay | Apr 1998 | |
1482232 | Hazeltine | Jan 1924 | |
1795732 | Miller | Mar 1931 | |
2050402 | Walsh | Mar 1936 | |
2861810 | Veatch | Nov 1958 | |
3054615 | Budish | Sep 1962 | |
4284276 | Worst | Aug 1981 | |
4603862 | Chen | Aug 1986 | |
4664387 | Tardiff | May 1987 | |
4878674 | Newcomb et al. | Nov 1989 | |
5427378 | Murphy | Jun 1995 | |
5662534 | Kroll et al. | Sep 1997 |