35 years ago (as of 2019) I entered the second phase of my working life – doing what I love best, ie., designing products.
In those days, there was no CAD yet, and everything had to be done by hand, aided by drafting machines. Many people were still using pencils, but in the company that I worked for, we used “Drafting Pens”. These were high quality instruments that produced very uniform lines of precise widths.
There were several brands then, such as Faber-Castell, Staedtler, etc. But the “Rolls-Royce” of these pens were from Rotring – every draftsman worth his lines had to be seen in possession of a set.
With these pens, our ideas were put onto drawings, which were then used by toolmakers to produce the tools and products as required.
Alas, these prized instruments are now museum pieces.