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John Barr is a Principal Mechanical Design Engineer with over 20 years of experience in defense product development and reverse engineering. John has worked with various companies in the defense, mass transit, telecom, and technology industries, designing a variety of products including night vision devices, missile systems, radar systems, and enclosures for transmitters and receivers. John's expertise lies in mechanical design and CAD/CADD drafting, making him a valuable asset to any engineering team.