Number | Date | Country | Kind |
---|---|---|---|
1-318279 | Dec 1989 | JPX | |
2-254609 | Sep 1990 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
1900824 | Lewis | Mar 1933 | |
1921164 | Lewis | Aug 1933 | |
3503831 | Oyama | Mar 1970 | |
3870594 | Kudo | Mar 1975 | |
3960639 | Kudo | Jun 1976 | |
4337682 | Schwichtenberg | Jul 1982 | |
4543284 | Baum | Sep 1985 | |
4689257 | Baum | Aug 1987 |
Number | Date | Country |
---|---|---|
2050245 | Jan 1981 | GBX |
Entry |
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World Patents Index Latest, Week 8126, Derwent Publications, Ltd. AN 81-46823D and JP-A 56-053073, May 12, 1981. |