Which architectural drafting tool brand, founded in 1928, revolutionized precision drawing with their iconic Rapidograph technical pen that became essential in architectural studios worldwide?

Before CAD systems dominated architectural drafting, precision tools were the lifeblood of every architect's studio. Among these, certain brands became legendary for their quality and innovation. This trivia question explores the history of one such iconic brand that revolutionized technical drawing and remains respected in architectural circles today, even in our digital age.

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Rotring
Staedtler
Faber-Castell
Koh-I-Noor