METHOD OF ELIMINATING ABSORPTION OF DRILLING MUDS AND CEMENTS von BIKBOV KIM S,SU, SEMENOV NIKOLAJ YA,SU, SHIBIRKIN IVAN M,SU, SHLEVIN DAVID N,SU, RIZVANOV NAIL M,SU, KHORKOV PETR N,SU, YAKOVLEV VITALIJ A,SU, ROGOZHIN NIKOLAJ F,SU

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DEVICE FOR PERCUSSIVE DRILLING von ZHANTEMIROV SABIR D,SU, KIM MOISEJ F,SU, FISENKO BORIS ,SU, BIKBOV ASKHAT ,SU, YADRENNIKOV VITALIJ M,SU, LENSKIJ VASILIJ V,SU

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