Yellow paper document sent to Albert Starr in which M. Lowell Edwards discusses changes to the valve design, sewing ring and oscillating ball. 1960 December 7 The M. Lowell Edwards Public History Project was made possible by a grant from the Edwards Lifesciences Fund. We are grateful to Teresa Edwards Allen and the extended family of M. Lowell Edwards for their generosity in sharing documents from the estate of M. Lowell Edwards. We also thank Richard J. Mullins, M.D. for his many contributions to this project.