Scope and Contents The records relate to Propper Thread Company’s work to design a new bobbin winding machine and contain plans, lists, notes relating to parts used in the machine, correspondence, computations, and patent records research from 1958 to 1965. The files are arranged alphabetically by topic/type of document. Many of the small plans and sketches were drawn by Andy Conca, however his name does not appear on the 33-sheet set of drawings. Conca also worked with Allen Devinatz, Associate...