Old Technology - A History of Technical Lettering
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Typotheque: From Lettering Guides to CNC Plotters — A Brief History of Technical Lettering Tools
https://www.typotheque.com/articles/from-lettering-guides-to-cnc-plotters-a-brief-history-of-technical-lettering-tools
This article highlights some major steps in the historical development of lettering tools for drafting.
A brief history of how lettering on technical documents went from handwritten, difficult to read lettering to interesting an unique templates before computer created documents were possible.