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Manufacture of roof tiles
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Patent number 6,071,448
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Issue date Jun 6, 2000
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Bhushan Kumar Oberoi
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B28 - WORKING CEMENT, CLAY, OR STONE
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Moulding pallet
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Patent number 4,832,309
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Issue date May 23, 1989
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Gerald Derby-Lewis
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B28 - WORKING CEMENT, CLAY, OR STONE
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2870512
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Patent number 2,870,512
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Issue date Jan 27, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2636243
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Patent number 2,636,243
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Issue date Apr 28, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2496078
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Patent number 2,496,078
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Issue date Jan 31, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2282891
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Patent number 2,282,891
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Issue date May 12, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2206803
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Patent number 2,206,803
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Issue date Jul 2, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2098382
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Patent number 2,098,382
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Issue date Nov 9, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE