735Ad18: "Rohwer" - "Patented concrete casing with slotted perforations"

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http://hdl.handle.net/10217/176380
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Abstract
Note on envelope reads, "Irrigation wells". Title information from "Putting Down and Developing Wells for Irrigation" by Carl Rohwer. See Figure 34, which also reads, "Rings are held together by cable threaded through holes in concrete."
Date
1940?
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