Number | Date | Country | Kind |
---|---|---|---|
3528135 | Aug 1985 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
1903823 | Lougheed | Apr 1933 | |
4044797 | Fujie et al. | Aug 1977 | |
4180290 | Drews | Dec 1979 | |
4650138 | Grose | Mar 1987 | |
4706910 | Walsh | Nov 1987 |
Number | Date | Country |
---|---|---|
393086 | Dec 1908 | FRX |
587211 | Apr 1925 | FRX |
104114 | Feb 1917 | GBX |
324441 | Jan 1930 | GBX |
Entry |
---|
NASA Tech. Brief, vol. 5, No. 2, Summer 1980, "Grooves Reduce Air". |