The Rise of an Inventive Profession: Learning Effects in the Midwestern Harvester Industry, 1850–1890
利用近千项专利数据，追踪了19世纪中西部收割机行业专业发明者的起源与演变，发现到1870年代发明者已融入行业，企业成为学习中心并催生了技术市场。
This article makes use of nearly one thousand patents to trace the origins and evolution of professional invention in the midwestern harvester industry. These data indicate that professional inventors had become integrated into the industry by the 1870s. This unity of business and invention made firms loci of learning and fostered the rise of a market in technology through which patents and patentees became available.