37 Load cell installation and maintenance services; installation and maintenance services of wireless end-of-crane scales; installation, maintenance and fixing services for booth printing systems; installation and maintenance services for wireless communication systems between load cells, lecterns and printers; installation and maintenance services for scientific, optical, weighing, measuring, signaling, control (inspection), measuring instruments, weighing machines, scales, steelyards (scales), dynamometers, measurements, measurement stands, load cells, load indicators, displays, touch screens; keyboards, distribution desks (electricity), printers, software (recorded programs) and/or web-based application management interfaces for mobile terminals and tablets