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Scientific American, Vol. 64, No. 1 (1891) (1891)
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in Fig. 1 of the engraving. As fast as neces- in the way of machinery. The labor of laying such mains has been very severe, and progress necessarily slow, as the work is limited to one pointof attack. To secure a consecutive line without sleeve connec- moving over the trench. The two are separate… … © 1891 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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