... durability is 15-20 years,never go rusting. 2.one house one gantry feeding system.full automation,controled by electric system ... galvanized material, durability is15-20 years,never go rusting. 2.one row one independent trolley feeding machine,controled by electric system only 10 ... -15 minutes.save labor3. good looking,each row work independently,cannot effect each other feedng tower1.store food ...