MACHINE FOR DIGGING UNDER PIPES AND CATERPILLAR TRACTION DEVICE von KOVAL A.B, SAVENOK V.I, BYKOV A.V, VASILENKO S.K, CHERNYAEV V.D, DZHARDZHIMANOV A.S, LEICHENKO J.B, IBRAGIMOV M.SH, KUMYLGANOV A.S, MUSIIKO V.D, YAKOVLEV V.I

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