Yup, by 1933 it was pretty clear that you can't re-sharpen your DE blades:
http://blog.modernmechanix.com/delusions-about-shaving/
but that schtick about sharpening blades in a glass tumbler is interesting.
http://blog.modernmechanix.com/delusions-about-shaving/
but that schtick about sharpening blades in a glass tumbler is interesting.