Number | Date | Country | Kind |
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5-219603 | Sep 1993 | JPX |
Number | Name | Date | Kind |
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4566460 | Sato et al. | Jan 1986 | |
4974558 | Katakura et al. | Dec 1990 | |
5186177 | O'Donnell et al. | Feb 1993 |
Entry |
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P. D. Corl et al., "A digital synthetic focus acoustic imaging system for NDE", Proc. IEEE Ultrasonics Symp., Sep. 1978, pp. 263-268. |