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Roof gutter guard
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Patent number D310259
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Issue date Aug 28, 1990
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William G. Hitchins
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D23 - Environmental heating and cooling
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Modular building component
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Patent number 4,679,366
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Issue date Jul 14, 1987
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William G. Hitchins
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Building foundations invention
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Patent number 4,627,205
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Issue date Dec 9, 1986
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William G. Hitchins
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Hinged window-guard assembly
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Patent number 4,604,827
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Issue date Aug 12, 1986
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William G. Hitchins
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Gable overhang
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Patent number 4,583,332
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Issue date Apr 22, 1986
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William G. Hitchins
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E04 - BUILDING