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Denis the Inventor by Gennadi Ivanov (Paperback / softback, 2012)
Price:
AU $29.54
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By Gennadi Ivanov. Author Gennadi Ivanov. Ivanov Gennadiy Ivanovich is a 70-year old citizen of Russia, top-ranked design engineer and author of 150 inventions. He has an international certificate TRIZ Master.