This is a continuation of application Ser. No. 782,731, filed Dec. 10, 1968 now abandoned.
Number | Name | Date | Kind |
---|---|---|---|
2006022 | Kranzlein et al. | Jun 1935 | |
2818410 | Zwilgmeyer | Dec 1957 | |
3023212 | Richter | Feb 1962 | |
3122533 | Senn | Feb 1964 | |
3687929 | Ramanathan et al. | Aug 1972 | |
3788810 | Kalz et al. | Jan 1974 |
Number | Date | Country |
---|---|---|
1644680 | Jun 1969 | DT |
1769789 | Jan 1970 | DT |
Number | Date | Country | |
---|---|---|---|
Parent | 782731 | Dec 1968 |