Filing Document | Filing Date | Country | Kind | 102e Date | 371c Date |
---|---|---|---|---|---|
PCT/SU89/00177 | 6/23/1989 | 8/20/1991 | 8/20/1991 |
Publishing Document | Publishing Date | Country | Kind |
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WO91/00412 | 1/10/1991 |
Number | Name | Date | Kind |
---|---|---|---|
3005507 | Clark, Jr. et al. | Oct 1961 | |
3276523 | Olive | Oct 1966 | |
3997009 | Fox | Dec 1976 | |
4574894 | Jadwin | Mar 1986 |
Number | Date | Country |
---|---|---|
2486996 | Jan 1982 | FRX |
907365 | Oct 1962 | GBX |
2093566 | Dec 1982 | GBX |
Entry |
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M. T. Gusman et al., "Zaboinye vintovye dvigateli diya burenia skvazhin", 1981, Nedra, (Mskva), cf. p. 21, FIG. 8. |
SU, AI, 898028 (Permsky Filial Vsesojuznogo Nauchno-Issledovatelskogo Instituta Burovoi Tekhniki), Jan. 25, 1982 (25.01.82), cf. FIG. 1. |