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The data includes:
#Three random cross-sectional samples: Patents from the Annual Reports of the Commissioner of Patents **1870-71, 1890-91, 1910-11#Longitudinal data created by selected all inventors with names starting with "B"**- All patents for these inventors 25 years before and after they appeared in one the above samples
#Patents for "Great Inventors", as noted in the Dictionary of American Biography born from 1820-1885
 
==Legislation==
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