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3875321
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Patent number 3,875,321
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Issue date Apr 1, 1975
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C03 - GLASS MINERAL OR SLAG WOOL
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3512869
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Patent number 3,512,869
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Issue date May 19, 1970
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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3508956
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Patent number 3,508,956
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Issue date Apr 28, 1970
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C03 - GLASS MINERAL OR SLAG WOOL