This is a continuation-in-part-application of our co-pending application Ser. No. 457,971 filed Apr. 4, 1974, now abandoned.
Number | Name | Date | Kind |
---|---|---|---|
3109842 | Schilling et al. | Nov 1963 | |
3328384 | Dietz et al. | Jun 1967 | |
3555003 | Ribka | Jan 1971 | |
3609135 | Ribka | Sep 1971 |
Number | Date | Country | |
---|---|---|---|
Parent | 457971 | Apr 1974 |