I think it's the telephone because it allows people to communicate better and customers or workers don't have to walk up to everyone and disturb them. You may elaborate more on this with your own opinion
The Soviet Union had set up official border stations in which you had to cross to get to the other side. Eventually, they had set it up so they're was only one safe way to get to West Berlin, just one border stations. These border stations were quite strict, as they had people trying all sorts of crazy ways to get to West Berlin.
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................Wilbur and Orville Wright............
