Number | Date | Country | Kind |
---|---|---|---|
55-56169 | Apr 1980 | JPX | |
55-56170 | Apr 1980 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3270833 | Schroeder | Sep 1966 | |
3352378 | Schroeder | Nov 1967 | |
3827288 | Fletcher | Aug 1974 |
Number | Date | Country |
---|---|---|
2253207 | Jun 1975 | FRX |
Entry |
---|
Pallett et al.--Noise Control Engineering, vol. 7, No. 2, pp. 71-80, Sep.-Oct. 1976. |