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2748537
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Patent number 2,748,537
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Issue date Jun 5, 1956
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C03 - GLASS MINERAL OR SLAG WOOL
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1844154
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Patent number 1,844,154
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Issue date Feb 9, 1932
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C03 - GLASS MINERAL OR SLAG WOOL
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1712205
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Patent number 1,712,205
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Issue date May 7, 1929
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C03 - GLASS MINERAL OR SLAG WOOL
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1554275
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Patent number 1,554,275
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Issue date Sep 22, 1925
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C03 - GLASS MINERAL OR SLAG WOOL