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ENGINEERING INVENTION, Frank J. Sprague and the U.S. Electrical Industry. (). : .

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ENGINEERING INVENTION, Frank J. Sprague and the U.S. Electrical Industry. . : , . Text.

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ENGINEERING INVENTION, Frank J. Sprague and the U.S. Electrical Industry. . : , . Text.

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ENGINEERING INVENTION, Frank J. Sprague and the U.S. Electrical Industry. : , . Print.