Number | Name | Date | Kind |
---|---|---|---|
2053364 | Engholm | Sep 1936 | |
2231479 | Perry | Feb 1941 | |
2259907 | Olney | Oct 1941 | |
2269284 | Olson | Jan 1942 | |
2539672 | Olson et al. | Jan 1951 | |
3158697 | Gorike | Nov 1964 | |
3796839 | Torn | Mar 1974 | |
4146110 | Maloney et al. | Mar 1979 | |
4246447 | Vorie | Jan 1981 | |
4418248 | Mathis | Nov 1983 | |
4447678 | Fidi | May 1984 |
Number | Date | Country |
---|---|---|
830351 | Nov 1957 | GBX |
857413 | Dec 1960 | GBX |
Entry |
---|
Harry F. Olson, Elements of Acoustical Engineering RCA Labs., Princeton, N.J., 1947, p. 224. |