| Filing Document | Filing Date | Country | Kind | 102e Date | 371c Date |
|---|---|---|---|---|---|
| PCT/SU88/00112 | 5/20/1988 | 2/13/1990 | 2/13/1990 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO89/11651 | 11/30/1989 |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3552191 | Heseding | Jan 1971 | |
| 4289030 | Alers et al. | Sep 1981 | |
| 4679437 | Koike et al. | Jul 1987 | |
| 4805459 | Ferreira | Feb 1989 |
| Number | Date | Country |
|---|---|---|
| 2840456 | Mar 1980 | DEX |
| 6044618 | Apr 1978 | JPX |
| 6042415 | Oct 1979 | JPX |
| 461361 | Feb 1975 | SUX |
| 855487 | Aug 1981 | SUX |
| 1067432 | Jan 1984 | SUX |
| 1165981 | Jul 1985 | SUX |
| 2151786 | Jul 1985 | GBX |
| Entry |
|---|
| "Flaw Classification by a Spectral Division of Ultrasonic Echos", by H. Seiger and T. Wagner (Not International, vol. 16, No. 4, 8/83). |