Number | Date | Country | Kind |
---|---|---|---|
91 16405 | Dec 1991 | FRX |
Number | Name | Date | Kind |
---|---|---|---|
4113708 | Chapman et al. | Sep 1978 | |
4218509 | Edgar et al. | Aug 1980 | |
5081222 | Reimann et al. | Jan 1992 |
Number | Date | Country |
---|---|---|
1246898 | Dec 1969 | GBX |
Entry |
---|
Patent Abstracts of Japan, vol. 11 No. 394 (C465) (2841), Dec. 1987. |