Artifact Details Title Timing charts of Sigma, 7090 and Larc Catalog Number 102634092 Type Document Description Initials at bottom right on each page: HGK Stretch concepts course 1959-1961 Date Nov. 13, 1958; Nov. 15, 1958 Extent 3 p. Category Design drawing Subject IBM Project Stretch Credit Gift of Harwood G. Kolsky Lot Number X3021.2005 102634092.pdf