US Patent 1,904,006, granted 18 April 1933 to Gardiner C. Means of Poughkeepsie, New York, for a pattern control mechanism for looms. It replaces the jacquard card with a photographic or light-and-dark pattern sheet read by a photoelectric cell, whose amplified current varies the field of electromagnets that release heddle-moving armatures. The document has six sheets of drawings (mechanical views and a wiring diagram), the specification, numbered claims, and a certificate of correction dated May 1933.