Number | Date | Country | Kind |
---|---|---|---|
3-189488 | Jul 1991 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
2611696 | Keyes et al. | Sep 1952 | |
2719088 | Herz et al. | Sep 1955 | |
3471293 | Ohlschlager et al. | Oct 1969 | |
3480436 | Wilson | Nov 1969 | |
5019490 | Kobayashi et al. | May 1991 |
Number | Date | Country |
---|---|---|
663801 | Sep 1965 | BEX |
1077049 | Jul 1967 | GBX |
Entry |
---|
Derwent Abstract AN 90-316701, abstract of JP-A-2,225,476, Sep. 7, 1990. |