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Building blocks
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Patent number 5,277,008
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Issue date Jan 11, 1994
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Andrews; Alexander R.
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John R. Saulez
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E04 - BUILDING
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Log-joint system
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Patent number 4,312,161
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Issue date Jan 26, 1982
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Sebastian M. Goldade
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E04 - BUILDING
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3511005
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Patent number 3,511,005
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Issue date May 12, 1970
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E04 - BUILDING
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3449875
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Patent number 3,449,875
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Issue date Jun 17, 1969
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E04 - BUILDING
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3343328
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Patent number 3,343,328
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Issue date Sep 26, 1967
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E04 - BUILDING
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2624920
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Patent number 2,624,920
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Issue date Jan 13, 1953
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E04 - BUILDING
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1572780
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Patent number 1,572,780
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Issue date Feb 9, 1926
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E04 - BUILDING