WELL DRILLING DEVICE
DERKACH NIKOLAJ D,SU, INDRUPSKIJ DAVID I,SU, BERGSHTEJN OLEG YU,SU, VOROZHBITOV MARAT I,SU
Year of Publication 23.10.1992
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Year of Publication 23.10.1992
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LUBRICATING COMPOSITION
DERKACH NIKOLAJ D,SU, CHERVYAKOVA ELENA V,SU, TULUEVSKIJ NIKOLAJ V,SU, TSUMAREV YURIJ A,SU
Year of Publication 30.05.1987
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Year of Publication 30.05.1987
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BENCH FOR TESTING DRILLING TOOL UNDER HIGH PRESSURE
PETUKHOV IGNATIJ M,SU, DERKACH NIKOLAJ D,SU, SIMONOV GENRIKH A,SU, MARUTYANTS MIKHAIL I,SU, PLOTNIKOV VALERIJ M,SU, POPOV VLADIMIR I,SU
Year of Publication 15.06.1991
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Year of Publication 15.06.1991
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HOLE-BOTTOM MOTOR REDUCTION GEAR
DERKACH NIKOLAJ D,SU, NATAROV ALEKSANDR P,SU, KRUTIK ERNST N,SU, CHUDAKOV GEORGIJ F,SU
Year of Publication 15.07.1982
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Year of Publication 15.07.1982
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STAND FOR TESTING REDUCTION BOXES
KORCHAZHENKO KONSTANTIN K,SU, DERKACH NIKOLAJ D,SU, BUTYREV NIKOLAJ M,SU, CHUDAKOV GEORGIJ F,SU
Year of Publication 15.03.1982
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Year of Publication 15.03.1982
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HOLE-BOTTOM SCREW ENGINE
DERKACH NIKOLAJ D,SU, NIKOMAROV SAMUIL S,SU, KRUTIK ERNST N,SU, KOCHNEV ANATOLIJ M,SU
Year of Publication 23.01.1982
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Year of Publication 23.01.1982
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REDUCTION GEARING INSERT FOR DEEP WELL MOTOR
DERKACH NIKOLAJ D,SU, STROITELEV NIKOLAJ P,SU, KRUTIK ERNST N,SU, CHUDAKOV GEORGIJ F,SU, VADETSKIJ YURIJ V,SU
Year of Publication 30.11.1982
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Year of Publication 30.11.1982
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OIL PROTECTION SYSTEM OF HOLE-BOTTOM ENGINE
DERKACH NIKOLAJ D,SU, KRUTIK ERNST N,SU, CHUDAKOV GEORGIJ F,SU, ANDOSKIN VLADIMIR N,SU, VASILEV YURIJ S,SU
Year of Publication 15.03.1982
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Year of Publication 15.03.1982
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