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Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 510
Fig. 3. Automatic Ball-Controlled Device Operating Six Intermittent Filtration Beds at Wauwatosa, Wis. View taken Four Minutes after Discharge in Diversion Chamber. Dose, 6000 Gal. (After Alvorrl.) * £r* 't ■■ : - i Fig. 4. Mansfield Aerating Device.Engineering
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