Number | Date | Country | Kind |
---|---|---|---|
55-130979 | Sep 1980 | JPX | |
55-176515 | Dec 1980 | JPX | |
55-177831 | Dec 1980 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3301840 | Zelinski | Jan 1967 | |
3393182 | Trepka | Jul 1968 | |
3692874 | Farrar et al. | Sep 1972 | |
3741927 | Nordsick et al. | Jun 1973 | |
4026865 | Uranek et al. | May 1977 | |
4230815 | Itoh et al. | Oct 1980 |
Entry |
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Abstract, British 871073, (1979). |