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Concrete placing apparatus
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Patent number 4,247,269
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Issue date Jan 27, 1981
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Tigran V. Bezhanov
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B28 - WORKING CEMENT, CLAY, OR STONE
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3618182
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Patent number 3,618,182
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Issue date Nov 9, 1971
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E04 - BUILDING
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3497579
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Patent number 3,497,579
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Issue date Feb 24, 1970
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E04 - BUILDING
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3451108
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Patent number 3,451,108
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Issue date Jun 24, 1969
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E04 - BUILDING
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1894676
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Patent number 1,894,676
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Issue date Jan 17, 1933
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E04 - BUILDING
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1562465
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Patent number 1,562,465
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Issue date Nov 24, 1925
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E04 - BUILDING