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| Keywords: Patent 736, 602.jpg en Patent 736 602 Kahn system of reinforced concrete 2014-07-06 17 17 39 Patent office https //patentimages storage googleapis com/pages/US736602-0 png U S Patent office PD-USGov Uploaded with UploadWizard Patents from the United States Kahn System Julius Kahn inventor | ||||
