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1930-07-01 |
United States Gypsum Co |
Acoustical material and method of manufacturing same
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1940-09-30 |
1944-02-08 |
United States Gypsum Co |
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1954-11-22 |
1959-01-27 |
Celotex Corp |
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1958-12-29 |
1961-05-23 |
United States Gypsum Co |
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1961-02-10 |
1966-04-12 |
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United States Gypsum Co |
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1974-07-23 |
1977-02-22 |
United States Gypsum Company |
Gypsum wallboard -- making process and product
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1974-08-05 |
1977-06-14 |
Johns-Manville Corporation |
Method for the preparation of fibrous insoluble calcium sulfate anhydrite
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United States Gypsum Company |
Method of making thermoplastic hardboard from acetylated mat
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