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Security door
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Patent number 10,156,428
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Issue date Dec 18, 2018
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Dan L. Fultz
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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-
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Composite structural beam
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Patent number 4,741,144
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Issue date May 3, 1988
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Andre Graffin
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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3014250
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Patent number 3,014,250
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Issue date Dec 26, 1961
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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2679074
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Patent number 2,679,074
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Issue date May 25, 1954
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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1815719
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Patent number 1,815,719
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Issue date Jul 21, 1931
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS