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  • All fields: 18.8 x 23.7 cm
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    • Agricultural by-products lab, 1938

    • Iowa State University; Dept. of Chemical and Biological Engineering; Agricultural wastes
    • A large drum is partially visible on the left and a large can is sitting on a table in the center. There are a several pipes, valves, and a motor on the lower right. A Sweetland filter is on the floor at the bottom center of the photograph.
    • Research equipment,1938

    • Iowa State University; Dept. of Chemical and Biological Engineering
    • Two cylindrical tanks are connected together by pipes at the top. There is a large drum and motor at the base of this piece of equipment.

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