What is a radiograph pen?

Answer:

"Radiograph," in the case of pens, is a misnomer for the "Rapidograph" pen, made by the Koh-I-Noor company of Germany. The Rapidograph is a refillable "technical" pen used for drafting and other precision drawing. The Rapidograph comes in 7 nib sizes, from .17mm to 1.5mm

First answer by ID0411091261. Last edit by ID1202291733. Question popularity: 13 [recommend question].