Back then there were several ways to do this sort of thing. Rub-off dry transfer lettering like those from Letraset or mechanical pantographs like the Leroy we

Back then there were several ways to do this sort of thing. Rub-off dry transfer lettering like those from Letraset or mechanical pantographs like the Leroy were commonly used for technical lettering. But it was probably hand drawn -- "draftsman" and graphic artists were found in all sorts of office settings that you don't see today.