DEVICE FOR RETAINING PLUMB LINE WHEN REINFORCING VERTICAL MINE SHAFTS
PUDAK VITALIJ I,SU, BABICHEV VALERIJ A,SU, MAREEV IGOR L,SU, VLASENKOV ALEKSANDR V,SU, GUDZ ALEKSANDR G,SU
Year of Publication 15.12.1985
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Year of Publication 15.12.1985
Patent