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http://www.remotecentral.com/features/glossary1.htm
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http://www.ee.washington.edu/conselec/A95/projects/pierreg/works/works.htm
http://electronics.howstuffworks.com/inside-rc.htm
http://www.ideafinder.com/history/inventions/story061.htm
http://www.remotecentral.com/urcseries/index15.htm
http://www.arrl.org/news/features/2004/03/30/1/
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