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Fantastic article from 1970 explaining this just as the "Golden Age" DE blade wars had reached their pinnacle:
https://books.google.com/books?id=V...AB#v=onepage&q=Personna Ultra‐Chrome.&f=false
https://books.google.com/books?id=V...AB#v=onepage&q=Personna Ultra‐Chrome.&f=false