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METHOD OF AND APPARATUS FOR OPENING AND CLOSING HATCHES OF SHIP'S HOLDS IN PARTICULAR THOSE OF INLAND VESSELSURZOVYKH TRJUMOV SUDEN,GLAVNYM OBRAZOM DLJA PLAVANIJA PO WNUTRENNIM VODAM
METHOD OF AND APPARATUS FOR OPENING AND CLOSING HATCHES OF SHIP'S HOLDS IN PARTICULAR THOSE OF INLAND VESSELSURZOVYKH TRJUMOV SUDEN,GLAVNYM OBRAZOM DLJA PLAVANIJA PO WNUTRENNIM VODAM