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Louvre Windows
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Patent number 4,226,051
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Issue date Oct 7, 1980
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Beta Aluminium Products Limited
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Norman Thompson
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Louvre windows
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Patent number 4,187,641
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Issue date Feb 12, 1980
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Beta Aluminium Products Limited
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Norman Thompson
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS