Number | Name | Date | Kind |
---|---|---|---|
1874326 | Mason | Aug 1932 | |
3187834 | Bryson et al. | Jun 1965 | |
3382948 | Walker et al. | May 1968 | |
3503465 | Kobayashi et al. | Mar 1970 | |
4164266 | Collin et al. | Aug 1979 | |
4281741 | Blaser et al. | Aug 1981 | |
4287962 | Ingard et al. | Sep 1981 |
Entry |
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IAC Bulletin No. 4,1215.0, Industrial Acoustics Co. 1972. |