98. P1439 Fred Waldhauer demonstrates the proportional control system he and Cecil Coker developed in connection with 9 Evenings: Theatre & Engineering. Looking on are David Tudor (left), who will make extensive use of this system, and Billy Kluver., 1966. Photo: Unattributed. 10 x 8” gelatin silver print Photograph Collection. Robert Rauschenberg Foundation Archives, New York York [No copyright statement present on documentation list]