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Technological Extinctions of Industrial Firms: An Inquiry into their ...

Technological Extinctions of Industrial Firms: An Inquiry into their ...

Table 8 Indexes

Table 8 Indexes of Tire Labor Productivity (1925=100) Tires per man-hour Value Added per man-hour 1914 30 39 31 1919 92 1921 65 84 1922 88 1923 85 84 1924 99 1925 100 100 100 1926 102 1927 107 104 1928 117 1929 111 91 134 1930 121 1931 148 124 171 1932 150 1933 161 95 1934 161 1935 160 97 1936 162 1937 160 Tires per direct man-hour in six large plants Source: Gaffey [1940, p. 69] for tires per man-hour and value added per man-hour, Stern [1933, p. 72] for tires per direct man-hour in six large plants

Table 9 Prominent Mechanical Process Innovations 1901-1934 Innovation Date Major Stages Affected Enlarged calenders and mixing mills 1902 on Compounding, preparation of the plies and rubber sheets Bias cutting machine 1906-09 Preparation of the plies and rubber sheets Core tire builidng machine 1909 Assembly Vacuum dryer circa 1910 Preparation of rubber Faster calenders and mixing mills 1912 on Compounding, preparation of the plies and rubber sheets New machines for forming cord plies, 1915-1925 Preparation of the plies and rubber impregnating cords with rubber sheets Banbury mixer 1916 Compounding Drum tire building machine 1919 Assembly Pneumatic devices for opening molds after vulcanization 1920s Curing Molded type process mid 1920s Inner tubes Mechanical conveyors especially 1920s Multiple stages Plasticator circa 1930 Preparation of rubber Watch case vulcanizer circa 1930 Curing Merry-go-round conveyor for tire building circa 1930 Assembly Source: Wanning [1922], Stern [1933], Carlsmith [1934, pp. 124-127], Gaffey [1940], French [1985]

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