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- wikijaa.ru wiki/W._T._Blackwell_and_Company
- wikidkk.icu wiki/W._T._Blackwell_and_CompanyWikipedia® is a registered trademark of the Wikimedia Foundation, Inc. wikidkk.icu is an independent company and has no affiliation with Wikimedia Foundation.
- kk.wikidea.ru wiki/W._T._Blackwell_and_CompanyBlackwell's Durham Tobacco / American Tobacco Co., Open Durham [1].
- sarna.net wiki/Blackwell_Heavy_IndustriesGM bought out the company, but announced it wouldn't produce any of Blackwell's designs.[5].
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- ru.us.edu.vn en/Bull_Durham_Smoking_TobaccoBlackwell and his company's tactics with the brand paved the way for other corporations to succeed through the acquisition of the Bull Durham trademark.