Frederik Marinus van Gelderen (known as Frits) studied chemistry in Zurich, where he took his PhD degree. He was unmarried. Upon his return to the Netherlands, he settled at 50 Haaksbergerstraat in Enschede. From 1916 he worked at the Van Gelderen family business, which consisted of the Stoomweverij Nijverheid and the Ramie Union. The Ramie Union produced incandescent gas mantles and industrial ch…