Or.....a few guys like Kaman, Pieseckei, Bell.....and Sikorsky did his work in the USA....not Russia. The Russians also have a few guys who know something about building helicopters as well. Then there are the Italians, Germans, and the Japanese. Lots of people contribute to the success of the industry.
Tecpilot needs to read the entire thread and then form his post...the "history lesson" was in response to something that was said....and the consensus lately has been such "non-rotorcraft" issues sometimes work to generate interest and hopefully participation will improve as a result.
If you wish to discuss rotorcraft history....by all means start a thread....and if any interest exists out there...you will soon have an up and going thread.