43 The years 1830 to 1880 marked the maturing of the Machine Age born during the Industrial Revolution. One by one, older technologies gave way to new ones, based on power-driven machinery. Machinery was enlisted to help the housewife, the office worker, and the factory worker. Entirely new devices, such as the sewing machine and the typewriter, were invented, developed, mass-produced with specialized machine tools, and then marketed. They soon became indispensable.(24) The introduction of the turret lathe and the metal planer before the Civil War and subsequent improve ments of them and of drilling, milling, and grinding machines, coupled with improvements in accuracy and in knowledge of metallurgy advanced the machine-tools industry; and advance in the machine-tools industry was related intimately to advances in production for the economy as a whole. . . machine-tool manufacture, in particular, . . emerged into prominence as the very foundation of mechanization. It provided the machinery and tools for the expanding technology of mass production, and, indeed, the "master tools" of all industry.(25) 24 Carroll W. Pursell, Jr., "Machines and Machine Tools, 1830-1880," in Technology in Western Civilization, ed. by Kranzberg and Pursell, ojd. cit. p. 407. See also, H. J. Habakkuk, American and British Technology in the Nineteenth Century (Cambridge: The University Press, 1967); Nathan Rosenberg, "Technical Change in the Machine Tool Industry, 1840-1910," Journal of Economic History, XXIII (December, 1963), pp. UlU-Uj. 25 Samuel Rezneck, "Mass Production Since the War Between the States," in The Growth of the American Economy, ed. by Harold f7 Williamson (New York: Prentice Hall, Inc., 1951), p. 502.