The man that built the FNRS-1 balloon died in what year?
Auguste Piccard Auguste Antoine Piccard (28 January 1884 – 24 March 1962) was a Swiss physicist, inventor and explorer, known for his record-breaking hot air balloon flights, with which he studied Earth's upper atmosphere and cosmic rays, and for his invention of the first bathyscaphe, "FNRS-2", with which he made a number of unmanned dives in 1948 to explore the ocean's depths.
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.