Number | Name | Date | Kind |
---|---|---|---|
2733988 | Searle | Feb 1956 | |
3686303 | Knowles | Aug 1972 | |
3803208 | Szabo | Apr 1974 | |
3969370 | Dittmar | Jul 1976 | |
4002767 | Aldrich et al. | Jan 1977 | |
4009847 | Aldrich et al. | Mar 1977 |
Number | Date | Country |
---|---|---|
50-69233 | Oct 1973 | JPX |
Entry |
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