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Vertically slidable window unit
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Patent number 5,119,591
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Issue date Jun 9, 1992
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Product Design & Development, Inc.
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Maurice E. Sterner
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Tilt window balance shoe assembly
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Patent number 4,683,676
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Issue date Aug 4, 1987
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Product Design & Development, Inc.
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Maurice E. Sterner
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Single plane window or door structure
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Patent number 4,570,381
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Issue date Feb 18, 1986
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Product Design & Development, Inc.
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Maurice E. Sterner
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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