9 Scientific, surveying, photographic, optical, weighing, measuring, signal and control apparatuses and instruments electrical control apparatus and instruments, namely, sensors, pushbuttons, switches, rotating actuators, keypads, position sensors, pressure sensors, moisture sensors, knock sensors, light barriers, solenoid valves, electrical couplings, lasers for non-medical uses, bus systems, control terminals, signal lights, pointer instruments, LCD displays, screen relay and micro computer controls, electron-hydraulic remote control devices for attachments with electrical operators box; devises for recording, transmitting and playing sounds and images, namely computers for the transferring of information between different working stations; electronic and electric cables and lines for the transmission of electronic and electric impulses or voltage; switches for adjusting, regulating and turning on and off agricultural machinery and controls, antennas; blank magnetic recording media; calculators; data processes, namely, computers for use in connection with agricultural machinery; modular control systems composed of computers, transmitters and receivers for the control and guidance of agricultural machinery