TY JOUR TI THE SPEED MODE OF AEROPRODUCT FLOW WITH PARALLEL-SEQUENTIAL SECTIONS KW seeder KW flow KW distributor KW pipe KW pneumatic system KW simulation JO Bulletin Samara State Agricultural Academy AU Kravtsov, A.V. AU Konovalov, V.V. AU Zaitsev, V.Y. AU Dontsova, M.V. PY 2019 IS 4 PB Samara State Agrarian University