I was listening to a Fresh Air interview with Henry Winkler, who is severely dyslexic, and he was singing the praises of Dyslexic typefaces which almost all are sans-serif versions.  He said it was a godsend to him.  I never heard of dyslexic typefaces before.   I am partially dyslexic while my father had the full-blown version. If you google dyslexic typeface, there are several versions.  In my collection of 18 typewriters, only one, a SMC Coronet Electric, is sans-serif in elite font.  It was promoted to be easier to read even before dyslexia was well known.  Are there other manufacturers who had this as well?  I have always believed that my own dyslexia, with the inability to spell well, made me a very poor touch typist and I have always been a two fingered typist but since getting into typewriters my speed has improved a bit.  Still have to check spelling sometimes.