Number | Name | Date | Kind |
---|---|---|---|
1757075 | Earhart | May 1930 | |
2034905 | Jacobs | Mar 1936 | |
2039960 | Jacobs | May 1936 | |
2043976 | Schonitzer | Jun 1936 | |
2125010 | Wright | Jul 1938 | |
2137197 | Schonitzer | Nov 1938 | |
2140958 | Jacobs | Dec 1938 | |
2232498 | Travis | Feb 1941 | |
2237046 | Breitenwischer | Apr 1941 | |
2767422 | Ulrich | Oct 1956 | |
2882548 | Roethel | Apr 1959 | |
2980945 | Hollar, Jr. | Apr 1961 | |
3012269 | Bartel | Dec 1961 | |
3165777 | Peras | Jan 1965 | |
3392997 | Seckerson et al. | Jul 1968 | |
4532675 | Salazar | Aug 1985 | |
5444894 | Heiler | Aug 1995 |
Number | Date | Country |
---|---|---|
1387137 | Mar 1975 | GB |
Entry |
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Photocopy of two forms of prior art door checks. |