Upright letterforms with rounded corners for technical drawing, as defined in the German industry standard, DIN, in 1938. [Pool]
Berthold Fototypes offered both DIN 17 and the inclined DIN 16. So did Letraset. Their DIN 17 came in two weights: 17m is lighter and also slightly wider and, unlike the other style, has a monocular ‘a’.
Digitally available from Scangraphic. Peter Wiegel did another digitization under the GDR name, TGL 0-17.