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30-50 Liters Long Endurance Heavy Lifting Quadcopter Agriculture Spray Big Farming Agricultural Irrigation Drone with 50-70L Payload Seed Fertilizer Spreader, Find Details and Price about Drone Uav from 30-50 Liters Long Endurance Heavy Lifting Quadcopter Agriculture Spray Big Farming Agricultural Irrigation Drone with 50-70L Payload Seed Fertilizer Spreader - Nanjing Hongfei Aviation Technology Co., Ltd.