Number | Date | Country | Kind |
---|---|---|---|
3813839 | Apr 1989 | DEX |
This is a division of application Ser. No. 340,936, filed Apr. 20, 1989, now U.S. Pat. No. 4,988,694.
Number | Name | Date | Kind |
---|---|---|---|
3555035 | Meisels et al. | Jan 1971 | |
4939262 | Bonse et al. | Jul 1990 |
Number | Date | Country | |
---|---|---|---|
Parent | 340936 | Apr 1989 |