Number | Date | Country | Kind |
---|---|---|---|
13748/69 | Sep 1969 | CH |
This is a division of application Ser. No. 69,457, filed Sept. 3, 1970.
Number | Name | Date | Kind |
---|---|---|---|
2821547 | Klein | Jan 1958 | |
2911442 | Bain et al. | Nov 1959 |
Number | Date | Country | |
---|---|---|---|
Parent | 69457 | Sep 1970 |