[31]“Breakdown of an Automatic Mill," January 8, 1950 (typescript), McDonough, notebook, January 16, 1950, Engineering Memoranda, Progress Reports, March-June 1950, N/C Project Files; “Provisional Specifications Report," June 1950, N/C Project Files; Lockheed, “A Study of Aircraft Requirements for a Contour Milling Machine," Final Report to the Air Force, June 1950, AF 33 (38—9337), Parsons Files.
32]项目进展通报：第6号，1950年5月8日；项目进展通报：第7号，1950年7月6 日; Robert Marsh, “Machine Tool Requirements of the Parsons Project,” ParsonsProject Engineering Memorandum No. 2, June 29, 1950; Engineering Report No. 2, June30, 1950; Marsh, “Selection of Machine Tool," Parsons Project Engineering Memoran-dum No. 3, August 1950, all N/C Project Files; Parsons, diary notes, “The Digitron Sto-ry,”“Preliminary Report on Digitron,”August 29，1952;1955 年 4 月4 日 Parsons 致邦迪克斯公司的 Murray Kanes；1950 年 7 月 7 日 Parsons 致 Ralph Burton，都来自 Parsons的档案。
[35] 1979 年对 Elmo Rumley，John Parsons，Frank Stulen 的访谈；1955 年 8 月 23日Frank Stulen 致 John Parsons, Parsons Files。
[36] William Pease, note on phone call from Parsons and Rumley, December 19, 1950, N/C Project Files; “Proposal Supplement 2 to Fixed Price Contract for Supplies," December 19， 1950， N/C Project Files; 1950 年 12 月 9 日 William Pease 致 File; John Parsons, “History of Automatic Milling Machine Project to December 31, 1950," January 11, 1951，typescript，Parsons Files；1951 年 1 月19 日 William Pease 致 Gordon Brown，有关访问 莱特基地的事情，N/C Project Files。
第6章 数值控制（下）
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