Electromagnetic flowmeters, automatic control apparatus including program controllers, flow controllers termperature controllers, pressure controllers and level controllers, electrical or pneumatic measuring apparatus and instrument, indicating apparatus, electric or electronic installations for the remote control and supervision of industrial operations, electro-dynamic apparatus for the remote control of signals, remote control apparatus, monitoring apparatus (electric), regulating apparatus (electric), transmitters of electronic or electric signals relating to pressure, temperature, shock or humidity, sensors for flow, temperature, shock or humidity, detectors