Number | Name | Date | Kind |
---|---|---|---|
3113225 | Kleesattel et al. | Dec 1963 | |
3419447 | Hewitt | Dec 1968 | |
3464102 | Soloff | Sep 1969 | |
3483066 | Harris et al. | Dec 1969 | |
3601084 | Biro et al. | Aug 1971 | |
3661661 | Berleyoung | May 1972 | |
3939033 | Grgach et al. | Feb 1976 |
Number | Date | Country |
---|---|---|
1590644 | May 1970 | FR |
Entry |
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Stafford, R. D., Ultrasonics for Industry, Published by Life Science & Tech. Publications Ltd., (1970), pp. 9 and 11. |