The correct answer to this open question is the following.
Werner von Siemens found a way to insulate telegraph wires effectively.
The electrical industry wouldn't be the same without the legacy of Werner von Siemens.
He designed the pointer telegraph and founded his telegraph construction company in 1847, in the city of Berlin. He was the man who discovered the dynamo-electric principle, opening the door for the following discoveries that made possible the use of electricity as a source of power. In 1889, he designed the first electric elevator for people. The man was a genius.
