... system.They are widely used for storage of seeds, flour, feed, cement and chemistry, which need to be cleaned continually. With solid basic ... in storaging seed, flour, feed, breed, cement and chemical, which need to be cleaned frequently. With solid structure the conical- bottom has ... , 45and 60, among which the angle of 60 conical-bottom is usua They are widely used for storage of seeds, flour, feed ...