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| D242127 | Bonnett | Nov 1976 | |
| D249465 | MacTavish | Sep 1978 | |
| D260136 | Revill | Aug 1981 | |
| D295108 | Prytulla | Apr 1988 | |
| D319134 | Pryztulla | Aug 1991 | |
| D344385 | Pryztulla | Feb 1994 | |
| D345846 | Przytulla et al. | Apr 1994 | |
| 643743 | Harris | Feb 1900 | |
| 2025852 | Dillhoefer, Jr. | Dec 1935 | |
| 2043183 | Mauser | Jun 1936 | |
| 2078530 | Courtright et al. | Apr 1937 | |
| 3160312 | Johnston | Dec 1964 | |
| 3409201 | Carpenter, Jr. | Nov 1968 | |
| 3972450 | Walters | Aug 1976 | |
| 4004709 | Simkus | Jan 1977 | |
| 4412628 | Whitney | Nov 1983 | |
| 4767021 | Pies | Aug 1988 | |
| 4776479 | Schutz | Oct 1988 | |
| 4898296 | Burgdorf et al. | Feb 1990 | |
| 4934551 | Budenbender | Jun 1990 | |
| 4940135 | Hall | Jul 1990 | |
| 5014873 | Clemens et al. | May 1991 | |
| 5071028 | Murphy | Dec 1991 |
| Number | Date | Country |
|---|---|---|
| 0 309 015 | Mar 1989 | EPX |
| 8802842 | Nov 1988 | NLX |
| 636448 | Apr 1950 | GBX |
| 732766 | Jun 1955 | GBX |
| Entry |
|---|
| "Van Leer Closure Systems" Brochure, (Date Not Provided). |
| "What is it That Keeps the Tri-Sure System No. 1?" Brochure, (Date Not Provided). |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 01350 | Nov 1992 |