Johns Manville

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Johns Manville is an American company based in Denver, Colorado, that manufactures insulation, roofing materials and engineered products. For much of the 20th century, Johns-Manville was the global leader in the manufacture of asbestos-containing products, including asbestos pipe insulation, asbestos shingles, asbestos roofing materials and asbestos cement pipe. While the company historically was narrowly focused on asbestos products, Johns-Manville in 1935 began to gradually expand into the business of wooden building insulation and in 1959 abruptly established itself in the glass fiber business by taking over the fiber division of Libbey Owens Ford, which was the second largest by revenue in the United States. In 1978 Manville re-entered the lumber business in a big way with the purchase of Olinkraft, the former Forest Product Division of the Olin Corporation. The Johns-Manville Corporation went public on the New York Stock Exchange in 1928 and was included in the Dow Jones Industrial...

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