METHOD OF PRODUCING ROUND TUBES WITH HELICAL RIBS von GOLOVINOV M.F.,SU, STAROSTIN YU.S.,SU, IVANOV V.P.,SU, EROKHOV V.K.,SU, KROTKOV V.N.,SU, PLOKHOV V.I.,SU, AYUPOV R.N.,SU, ANISIMOV A.V.,SU

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BILLET FOR PRODUCING HEAT-EXCHANGE TUBES von BERDYUGINA A.I.,SU, GOLOVINOV M.F.,SU, SAPRYKIN A.A.,SU, KALNIN I.M.,SU, DYACHKOV F.N.,SU, EROKHOV V.K.,SU, KROTKOV V.N.,SU, PLOKHOV V.I.,SU, STAROSTIN YU.S.,SU, YUROV YU.V.,SU, KIRILLOV L.P.,SU, BYKOV A.V.,SU, AYUPOV R.N.,SU

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