Number | Name | Date | Kind |
---|---|---|---|
3073381 | Burmeister | Jan 1963 | |
3295257 | Douglass | Jan 1967 | |
3755968 | Williams | Sep 1973 | |
4073092 | Williams | Feb 1978 | |
5042555 | Owens | Aug 1991 |
Number | Date | Country |
---|---|---|
761743 | Feb 1965 | CAX |
685966 | Dec 1939 | DEX |
965721 | Jun 1961 | GBX |
Entry |
---|
OPMA/NSSEA, Sound Control Performance of Operable Partitions, 1993. |