In view of problems of small detection range. difficult installation position setting and easy misoperation existed in traditional protection devices for prevention of coal piling wearing tail rope. a protection system for prevention of coal piling wearing tail rope in mine was designed based on two-dimensional laser radar scanning technology and active infrared radiation sensor techn... https://www.jmannino.com/deal-time-bio365-BIOLITE-Soil-Grow-Bags-2-Gallons-great-save/