ROTARY-PERCUSSION DRILLING BIT
LYUDINOVSKOV IGOR N,SU, KOSTIN ALEKSANDR F,SU, OSIPOV ALEKSANDR A,SU, GALITSKOV GENNADIJ A,SU, KURDYUKOV ALEKSANDR S,SU, MIRONOV LEV A,SU, GLAZKOV VALERIJ V,SU, USTINOV VLADIMIR V,SU, PLEKHANOV ILYA D,SU, YAKIMOV VADIM P,SU
Year of Publication 23.12.1992
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Year of Publication 23.12.1992
Patent