Within the scope of public and technical lettering, the use of the DIN 1451 typefaces spread rapidly once they were adopted. They were released as celluloid lettering stencils for smaller applications, as larger metal stencils for application to machinery, vehicles and airplanes, and as cast metal lettering for street and building signage; nevertheless, printing type conforming to DIN 1451 have never been produced. During World War II, DIN 1451 was also adopted in the Protectorate of Bohemia and Moravia. The 1943 version of DIN 1451 added a set of Cyrillic characters, although their design did not match the weight and proportions of DIN "Mittelschrift."