[ Signaling and monitoring apparatus and instruments, namely, rotary and shaft encoders, transducers, ] inclinometers, optical motion sensors, motion detectors, infrared sensors for sensing motion and measurement of displacement, angles, slopes, elevation, tilt, velocity, length, direction of motion and standstill detection, and electrical controllers [ ; installations comprised of optical sensing edges, door sensors, rubber profiles, bumper guards activating control rods and floor coverings for electric and opto-electric protection, contact-sensitive or not, for the protection of edges, surfaces or spaces, particularly activating control rods and floor coverings; electric switches for pressure waves and pneumatic switches that convert pressure waves into electric pulses; electric, electronic and optical sensors and systems comprised of sensors, cables, video monitors, electrical, optical and digital signal monitors, controls encoders, transducers, inclinometers, rubber profiles, bumper guards, activating control rods and floor coverings, coding units, and transformers for measurement of displacement, angles, slopes, elevation, tilt, velocity, length, motion, direction of motion and standstill detection; opto-electronic angular coding units; opto-electronic encoders; electronic systems comprised of sensors, cables, video monitors, electrical, optical and digital signal monitors, controls encoders, transducers, inclinometers, rubber profiles, bumper guards, activating control rods and floor coverings, coding units, and transformers for displacement measurement; electronic sensors for angle measurement; electric and electronic controls, electric transformers and electrical connection cables for the aforementioned goods ]