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Valentin Stavrev
Sofia, Sofia-Grad, Bulgaria
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Aug. 20, 2017, 11 p.m. PDT
CubeSat Challenge
registered for challenge
March 9, 2016, 10:37 p.m. PST
Infrastructure Vision 2050 Challenge
registered for challenge
Feb. 2, 2016, 8:58 p.m. PST
Sky for All: Air Mobility for 2035 and Beyond
registered for challenge
