Here's a February 1970 Popular Science article on Chrome-Alloy DE Razors.
http://books.google.com/books?id=VQ...&as_pt=MAGAZINES&pg=PA60#v=twopage&q=&f=false
http://books.google.com/books?id=VQ...&as_pt=MAGAZINES&pg=PA60#v=twopage&q=&f=false