Number | Name | Date | Kind |
---|---|---|---|
3053544 | Gorsica | Sep 1962 | |
3363608 | Scherenberg et al. | Jan 1968 | |
3519281 | Tencher | Jul 1970 | |
3542382 | Hagmann | Nov 1970 | |
3560007 | Ascenio | Feb 1971 | |
3721452 | Black | Mar 1970 |
Entry |
---|
Roth, "Vacuum Sealing Techniques" (Pergamon Press -- 1966), pp. 422-425. |