Upright letterforms with rounded corners for technical drawing, as defined in the German industry standard, DIN, in 1938. [Pool]
Berthold offered both DIN 17 and the inclined DIN 16 for phototypesetting. [Berthold 1974] Letraset had a dry transfer version. [1969 leaflet] In or before 1975, Letraset added a second weight: DIN 17m (for Micronorm) is lighter, slightly wider, and distinguished by a monocular ‘a’. See also Normalisé Din (Mecanorma, 1968).