Comment by 2b3a51

"A clean implementation of a common lettering style found on technical drawings, engraved office signs, computer and typewriter keyboards, and some comic books and avionics from the mid-20th century."

Thanks to the authors/designers.

I remember orange-red ink on cream paper on the circuit diagrams (schematics) glued in the lids of war-surplus electronics. Also the fold out circuit diagrams in Iliffe press books. I shall use is as the font for maths revision posters this year.

I suspect that the letter forms that I remember were drawn in pen with stencils on the drawing board.