9 Electromagnetic couplings except for land vehicles; electromagnetic controls for machines, motors and engines, and parts therefor and installations consisting thereof; electromagnetic vibrator coils for generating vibrations; transformers; electric, electromechanical, and electronic flow switches for controlling the flow of electric current, gas and fluids; controls and regulating apparatus for controlling and regulating electricity, gas, or fluids, namely, voltage regulators and electronic valves for controlling gas or fluids, and installations consisting thereof; electric, electromechanical, and electronic valve controls for regulating the flow of gases and liquids; rectifiers; non-contact electric switches; physical and electrotechnical apparatus, instruments and devices, namely, electromagnets and permanent magnets for controlling electricity, gas, or fluids; electric and electronic control and regulating apparatus for the operation of magnets, in particular for adhesive magnets, locking magnets, oscillating magnets, electromagnetic vibrators, activation magnets and valve magnets; magnets, in particular electromagnets for direct current, alternating current and rotary current; electric contactors and magnetic switches, namely, automatically actuated switches; mounting magnets, lifting magnets; magnets, in particular adhesive magnets, locking magnets, oscillating magnets, activation magnets and valve magnets; electromagnetically actuated valves for controlling gas and fluids; and electric relays