9 Data processors and computers for detecting and warning of the unfastening of metal sheet piles; electric apparatus and instruments, namely declutching detectors, sensors, sensors with shear pin, connecting cables with protective tube, monitoring units, switches, monitoring unit indicators; scientific apparatus and instruments, namely declutching detectors, sensors, sensors with shear pin, connecting cables with protective tube, monitoring units, switches, monitoring unit indicators; apparatus and instruments for detecting unbuckled sheet piles, namely, declutching detectors, sensors, sensors with shear pin, connecting cables with protective tube, monitoring units, switches, monitoring unit indicators; data processing equipment and computers