Helmuth Riepe creatively expands on the Tiku concept; taking it a step further by developing the rOtring rapidograph. The results become the prototypical technical pen. The new technology replaces the ruling pen of the day and greatly simplifies technical drawing (and continues to do so today), creating the technical pen category. The rotring Rollerpen and the “Tiku-Kuli” ballpen become key writing instrument innovations of the 1950’s.