US Patent 3,945,406, granted March 23, 1976 to Karl W. Wueger and assigned to Crompton & Knowles Corporation, describes a mechanism and method for forming a leno selvage on a loom. Two selvage threads run from supply packages through guides that rotate about a horizontal axis. A stationary cam and pivoted levers with followers make the threads dwell in the open upper and lower shed positions and then cross quickly, which suits higher-speed looms. The document includes the full patent text from a USPTO database printout, a scan of the printed patent, the claims (7), and drawings (Figs. 1-4).