rOtring Foliograph, a rarer model of technical pen by rOtring. used with etching ink on uncoated drafting film, leaving a permanent, crisp and deep black line, used to make a master drawing,
Rotring collection I was gifted. I've identified two micronorm pens, one rapidograph and what I think is a variant head. What are all the small parts (right side) for? : r/rOtring