Centro de Estudios Tecnicos de Materiales Especiales (CETME) is a state-owned company based in Spain. It is now known as Empresa National Santa Barbara, and was the company responsible for the development of the CETME mod.A.
CETME was founded in 1949 to develop small arms for the Spanish military. Around the same time, CETME employed the German arms designer Ludwig Vorgrimmler, who worked for the Mauser Werke in Germany before and during World War II. The Vorgrimmler was the designer of the experimental German assault rifle, known as "Gerat 06" or STG 45(M).
This rifle was not manufactured in any quantities, but its design served as a basis for further development at the CETME, and more important, at the another German company, Heckler & Koch, which obtained a license for the Vorgrimmler/CETME rifle design around 1957. This deal later resulted in the famous family of Heckler & Koch firearms, like the G3 and HK33 assault rifles, HK21 and HK23 machine guns, MP5 submachine guns and numerous other small arms that achieved worldwide popularity. All of the aforementioned weapons are built using the delayed blowback system of operation, designed by Vorgrimmler and his men at the Mauser in 1945 and refined by CETME.