US Patent 2,703,587, granted March 8, 1955 to George T. Allenson of Lincoln, R.I., and assigned to Draper Corporation. It describes a compact unit mounted near the fell of the cloth that feeds and sheds a pair of selvage threads to make a twisted (leno-type) selvage on looms that do not form a selvage naturally. Concentric inner and outer shafts carry the thread supplies and a feeding disk, driven from the loom camshaft through gears and a Geneva movement for intermittent rotation. The document has two drawing sheets, the specification, and nine claims.