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3. A. Johnson, “Index tolerance chart simplifies production”,The Tool Engineer,32(2), pp. 53–62, February 1954.
4. C. T. Mooney, “How to adjust tolerance charts”,The Tool Engineer,35(4), pp. 75–81, October 1955.
5. O. R. Wade,Tolerance Control in Design and Manufacturing, Industrial Press, New York, 1967.