TY JOUR TI STUDY OF HERMETIC ABILITY OF A COMBINED FERROFLUIDIC SEALED OF BEARING ASSEMBLIES KW assembly KW fluid KW hermetic seal KW packing KW durability JO Bulletin Samara State Agricultural Academy AU Terentyev, V.V. AU Bausov, A.M. AU Toropov, M.V. PY 2021 IS 6 PB Samara State Agrarian University