Patent Grant
D325631
| Number | Name | Date | Kind |
|---|---|---|---|
| 820216 | Leffingwell et al. | May 1906 | |
| 1968454 | Hyatt | Jul 1934 | |
| 2832560 | Grigsby | Feb 1957 | |
| 3698681 | Lacey | Oct 1972 | |
| 3822052 | Lange | Jul 1974 | |
| 3900184 | Burke et al. | Aug 1975 | |
| 3915167 | Waterman | Oct 1975 | |
| 3942228 | Buckman et al. | Mar 1976 | |
| 4091815 | Larsen | May 1978 | |
| 4112944 | Williams | Sep 1978 | |
| 4193174 | Stephens | Mar 1980 | |
| 4247076 | Larkin | Jan 1981 | |
| 4346869 | MacNeill | Aug 1982 | |
| 4460358 | Somerville et al. | Jul 1984 | |
| 4689043 | Bisha | Aug 1987 | |
| 4787406 | Edwards et al. | Nov 1988 |
