Norm-Entwurf
17/30321964 DC
17/30321964 DC
BS ISO 20318-2. Mechanical pencils and leads for general use. Classification, dimensions, quality and test methods. Part 2. Black leads
Titel (englisch)
BS ISO 20318-2. Mechanical pencils and leads for general use. Classification, dimensions, quality and test methods. Part 2. Black leads