Westinghouse payed attention to the problems of railroad signaling. By purchasing patents to combine with his own inventions, he was able to develop a complete electrical and compressed-air signal system. In 1883 he began to apply his special knowledge of air brakes to the problem of safely piping natural gas, and within two years he obtained 38 patents for piping equipment.
The city of Berlin was vulnerable to Soviet influence it was located within the Soviet zone of Germany.
Berlin was located deep in the Russian zone after the agreement after World War II which divided Germany and Berlin into occupation zones. That agreement arose from the Yalta Conference.
They ic red bc they were really old back in the day and they we weird
I believe the answer is: C. development of medieval guild towns and cities
A long with urbanisation, the centre of all economic activities were started to shifted into large cities with highly populated area. When this happen, Guild towns that established to excel at a certain economic sectors would started to established in order to gather as much talented members as possible.