What factors contribute to the fact that only a handful of countries manufacture aircraft jet engines? [closed]
The USA (GE, Pratt & Whitney), Russia (NPO Saturn, Klimov), France (Snecma) and the UK (Rolls Royce) are the only countries that have aircraft jet engine manufacturers. What factors might ...
What caused the rise and virtual ubiquity of the cell (mobile) phone in the United States? Over the past 25 years (+/-) in the United States, the mobile phone has morphed from being a novelty or ...