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3897232
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Patent number 3,897,232
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Issue date Jul 29, 1975
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C03 - GLASS MINERAL OR SLAG WOOL
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3823920
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Patent number 3,823,920
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Issue date Jul 16, 1974
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C03 - GLASS MINERAL OR SLAG WOOL
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3741742
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Patent number 3,741,742
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Issue date Jun 26, 1973
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C03 - GLASS MINERAL OR SLAG WOOL
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3730695
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Patent number 3,730,695
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Issue date May 1, 1973
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G05 - CONTROLLING REGULATING
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3725022
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Patent number 3,725,022
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Issue date Apr 3, 1973
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C03 - GLASS MINERAL OR SLAG WOOL