[2] J. Foster Petree, introduction, Henry Maudslay, 1771-1831, and Maudslay Sons and Field, Ltd. (London: The Maudslay Society, 1949).
[3] American Machinist (September 28, 1916), vol. 45, no. 13, pp. 529-531.
[4] U.S. patent 10383 issued to Joseph Nason of New York, January 3, 1854.
[5] U.S. patent 293930 issued to Charles Vander Woerd of Waltham, Massachusetts, February 19, 1884.
[6] U.S. patent 1874592, filed June 8, 1929, issued to C. G. Olson of Chicago, Illinois, August 30, 1932, and assigned to the Illinois Tool Works, also of Chicago.
[7] U.S. patent 1901926, filed February 16, 1928, issued to C. G. Olson of Chicago, Illinois, March 21, 1933, and assigned to the Illinois Tool Works, also of Chicago.
[8] U.S. patent 1899654, filed August 31, 1931, issued to F. A. Ward of Detroit, Michigan, February 28, 1933, and assigned to the Gear Grinding Company of Detroit, Michigan.
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