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Long before computers (and even phototypesetting equipment), many rules and lines were drawn by hand with Rapidograph pens. They are technical fountain pens that contain a plastic cartridge filled with an "India-type" ink. Most designers invested in an entire set of the pens which were numbered and color-coded from No. 5x0 - pink (a micro fine line) to No. 9 - emerald green (a macro bold line).
Rapidograph pens consistently provide uniform lines - it was not unusual for a designer to draw all horizontal lines one day, then return to draw vertical lines the next day.