Number | Date | Country | Kind |
---|---|---|---|
3714533 | Apr 1988 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3562199 | Hill et al. | Feb 1971 | |
3725362 | Walker | Apr 1973 |
Number | Date | Country |
---|---|---|
1056226 | Jan 1967 | GBX |
Entry |
---|
Patent Abstracts of Japan, vol. 12, No. 230(C-508)[3077], Jun. 29, 1988. |
Number | Date | Country | |
---|---|---|---|
Parent | 436127 | Nov 1989 | |
Parent | 336716 | Apr 1989 |