in Europe," in M. A. DeVries, ed. , The Expanding World of N/C (Numerical Control Society, 1981) , p. 2; Alvin J. Harman and Arthur J. Alexander, “Technological Innovation by Firms,” Rand Corp. R—2237—NSF, November 1977, p. 52 (courtesy Judith Reppy).
[17] Clifford Fawcett, “Factors and Issues in the Survival and Growth of the U. S. Machine Tool Industry," Ph. D. dissertation, 1976 (University Microfilms); National Machine Tool Builders Association，Economic Handbook，1980/81，p. 180；1980 年对西德皮 特勒机床公司的开发部主管 Paul Stockmann 的访谈；See also Judith V. Reppy，“The Role of the Air Force in the Development of N/C Machine Tools," unpublished paper, Cornell Center for International Studies, 1981 (courtesy Judith Reppy); Melman, Profits without Production.
[18] George W. Younkin, “N/C Machining... We've Come a Long Way"; Edward E. Miller testimony, Hearings before Subcommittee; John H. Greening, “N/C, DNC, CAM: Panacea or Poison?" in DeVries, ed. , The Expanding World of N/C, p. 246.
[19] Fawcett, “Factors and Issues in the Survival and Growth of the U. S. MachineTool Industry”；Edward E. Miller 在科技子委员会听证会上的证词。
[20] A. Curtis Daniell 在科技子委员会听证会上的证词；Edward C Grimshaw，语出自 Charles Weiner, "Which Door to Tape Control?" Tooling and Production (January1961), p. 49.
[23] A. S. Thomas, "Is There a Need for Higher Level N/C Software?" (typescript)(蒙 A. S. Thomas 惠允)，没有出版日期。
[24]A.S. Thomas 在科技子委员会听证会上的书面证词。
[25] 1979 年对 John Parsons 的访谈；“PARTRAN,”brochure(courtesy John Par-sons)。
[26]同上; Curtis Reichold,“NUFORM: The Universal N/C Language,”N/CCOMMINE, n. d. (courtesy A. S. Thomas); "Language Study Yields a Worthy Bench-mark,”Iron Age(October 28，1974)，pp. 51—57；1978 年对 A. S. Thomas 的访谈。
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