Number | Date | Country | Kind |
---|---|---|---|
89 13687 | Oct 1989 | FRX |
Number | Name | Date | Kind |
---|---|---|---|
1611932 | Mathes | Dec 1926 | |
1814238 | Bode | Jul 1931 | |
1897639 | Kreer, Jr. | Feb 1933 | |
2762018 | Purrington | Sep 1956 | |
2832047 | Miller | Apr 1958 | |
3103554 | Avins et al. | Sep 1963 | |
4264881 | De Ronde | Apr 1981 |
Number | Date | Country |
---|---|---|
1214809 | Feb 1963 | DEX |
0841560 | Sep 1956 | GBX |
Entry |
---|
Gourevitch, "Les filtres elliptiques plats", Toute L-electronique, Aug./Sep. 1976, pp. 59-63. |