Number | Name | Date | Kind |
---|---|---|---|
2391661 | Watkins et al. | Dec 1945 | |
2498400 | Du Lude | Feb 1950 | |
4438874 | Zuckerman et al. | Mar 1984 | |
4653678 | Blanchard et al. | Mar 1987 | |
4871098 | Bredeweg et al. | Oct 1989 |
Entry |
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WO 84/02836 PCT Publication; Feldinger, 8-1984. |
EP 0144653 EPO Publication; Kotowski; 6-1985. |