Keywords: Kahn system riveted shearing reinforcements 3X.jpg en Kahn system of reinforced concrete beams using riveted shearing reinforcements 1903 Patent US736602 A https //www google com/patents/US736602 dq 736602 hl en sa X ei Dtq6U6mWKtK3yATn1IHgAg ved 0CBwQ6AEwAA US Government - Patent Office PD-USGov Uploaded with UploadWizard Kahn System |