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3518331
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Patent number 3,518,331
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Issue date Jun 30, 1970
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E04 - BUILDING
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3453788
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Patent number 3,453,788
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Issue date Jul 8, 1969
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E04 - BUILDING
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3441242
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Patent number 3,441,242
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Issue date Apr 29, 1969
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E04 - BUILDING
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2648116
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Patent number 2,648,116
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Issue date Aug 11, 1953
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E04 - BUILDING