MILLSTONE Isidore E. Millstone, a founder of Millstone-Bangert Inc., a major building and heavy contractor in Saint Louis and a local philanthropist, is presumed dead at 102 after an apparent suicide on May 16. A 1927 engineering graduate of local Washington University, he founded Millstone Construction in 1929. His firm merged with Bangert Construction in 1996. The firm built Busch Stadium, among other local landmarks. He managed projects in Israel in the 1950s.