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1945 Jrnl. Royal Statist. Soc. 108 447 The methods of ‘quality control’ in production are now well established..but there is room for much work in a general oversight of the subject, and in the further study of data provided by ‘Q.C.’ records.

1969 T. C. Thorstensen Pract. Leather Technol. x. 159 (caption) After condensation, the product is neutralized, if desired, and dried prior to shipping. Frequent chemical analysis is made for quality control (QC check).

1991 Design Engin. Aug. 23 (advt.) Do your current trading needs involve welding technology and engineering, non-destructive testing, materials and corrosion, QC or design?

1846 Times 11 Mar. 7/5 Mr. Whitehurst, Q.C., and Mr. Wildman conducted the plaintiff's case.

1887 D. Lloyd George Let. 25 Feb. (1973) 18 A Q.C. of high standing.

1988 Advocate (Vancouver, Brit. Columbia) Nov. 851 A letter from a former professor (and a Q.C.) contained the following words.

2004 H. Kennedy Just Law (2005) vi. 144 The Bar claims that the rank of QC is a hallmark which lets solicitors and clients know who the best advocates are.