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> Competing company DuPont had just invented cellophane

This is not true. http://en.wikipedia.org/wiki/Cellophane#History

The author may have, mistakenly, attributed a quote as fact from one of the interviewees.

Interestingly enough, from the same link, Dupont appears to have invented/optimized a moisture-proof cellulose, which may have been what the author was referring to?

It's probably fair to say Dupont introduced it into widespread use in the United States given that they were the first to manufacture it there.

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