Number | Date | Country | Kind |
---|---|---|---|
7312973 | Sep 1973 | NL |
Number | Name | Date | Kind |
---|---|---|---|
2228052 | Gardner | Jan 1941 | |
2368650 | Fischer | Feb 1945 | |
2374186 | Fischer | Apr 1945 | |
2400493 | Fischer | May 1946 |
Number | Date | Country |
---|---|---|
702,238 | Jan 1965 | CA |
Entry |
---|
Engineering News-Record, Mar. 18, 1948, p. 183. |