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defiance testing & engineering is a full-service product development company offering one of the broadest ranges of technical services available in the transportation industry. by combining both physical and analytical test methods within one company, defiance testing & engineering offer innovative approaches to complex problems, greatly reducing development time and costs. specific services include full vehicle and system simulation testing, fatigue, durability, safety, noise and sound quality evaluations, data acquisition and analysis, simulated environment, heat management and computer aided engineering (cae).