C.Ed. Schulte GmbH Zylinderschlossfabrik (CES), founded in 1840 and headquartered in Velbert, Germany, is a leading manufacturer of mechanical and electronic locking systems. The company's product range includes master key systems, electronic access control systems, and door locks, serving public and industrial buildings.

Notable projects featuring CES locking systems include the Reichstag building in Berlin, the Elbphilharmonie in Hamburg, and the University of Oxford. With approximately 430 employees, CES remains a family-owned enterprise, committed to innovation and maintaining strong regional roots. CES mortise locks and cylinders are designed to meet both ANSI and EN standards and are ISO 9001 certified, adhering to the highest environmental standards in accordance with ISO 50001, ISO 14025, and DIN EN 16247-1.