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Dalzell, F. (2009-09-25). Introduction: Technology and Innovation at the Turn of a Century. In Engineering Invention: Frank J. Sprague and the U.S. Electrical Industry. : The MIT Press. Retrieved 20 Sep. 2021, from https://mitpress.universitypressscholarship.com/view/10.7551/mitpress/9780262042567.001.0001/upso-9780262042567-chapter-1.