Improved signalling apparatus adapted for giving warning in the event of variation or breakdown in electric circuits
DE489288C
Electrical train protection by means of a magnet armature arranged in a closed housing on the vehicle
DE481792C
Control valve for train control devices by inductive means using solenoid valves to repeat the line signal settings on locomotives and railcars
DE425530C
Switching device for remote control and automatic remote switch-on of electrical lamps by means of an electromagnet with two coils that neutralize each other under normal conditions
DE484879C
Display device for hearing and visualizing the extinguishing of an alternating current powered lamp
