Number | Date | Country | Kind |
---|---|---|---|
3920466 | Jun 1989 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3036980 | Dunham Jr. et al. | May 1962 | |
3832327 | Hackbarth et al. | Aug 1974 | |
4612342 | Kostinko | Sep 1986 |
Number | Date | Country |
---|---|---|
1196849 | Nov 1959 | FRX |
2040900 | Sep 1980 | GBX |
Entry |
---|
WPIL Database, JP-A-62240338, Derwent Publications Ltd., London, GB (10/21/87). |