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Safety door
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Patent number 9,228,390
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Issue date Jan 5, 2016
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Ye Myung Lee
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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3338013
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Patent number 3,338,013
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Issue date Aug 29, 1967
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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3121262
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Patent number 3,121,262
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Issue date Feb 18, 1964
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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2889594
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Patent number 2,889,594
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Issue date Jun 9, 1959
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
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2722721
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Patent number 2,722,721
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Issue date Nov 8, 1955
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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2620521
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Patent number 2,620,521
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Issue date Dec 9, 1952
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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2302487
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Patent number 2,302,487
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Issue date Nov 17, 1942
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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1374580
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Patent number 1,374,580
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Issue date Apr 12, 1921
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS