The man that built the FNRS-1 balloon died in what year?
FNRS-1 The FNRS-1 was a balloon, built by Auguste Piccard, that set a world altitude record. It was named after the Belgian Fonds National de la Recherche Scientifique, which funded the balloon.
Henri Mignet Henri Mignet, (October 19, 1893 – August 31, 1965), was a French radio engineer who became well known as an aircraft designer and builder. His most famous design is the "Flying Flea" family of aircraft.