In 1900 Ann Arbor's industrial strength lay in light manufacturing, milling, furniture making, piano building, brewing, gas fixtures, and rug making. Ann Arbor's largest manufacturing interest in 1900 was milling. The Michigan Milling Company was a conglomerate composed of the Argo Flour Mill, the Ann Arbor City Mills, Delhi Mills, the Ann Arbor Central Mills, and the Osborne Mill. The company also owned power sites and cooperage plants. By 1913 its estimated output was one million dollars a year.

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