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Landscaping block system
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Patent number 5,588,262
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Issue date Dec 31, 1996
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Keystone Retaining Wall Systems, Inc.
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William B. Dawson
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B28 - WORKING CEMENT, CLAY, OR STONE
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3669597
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Patent number 3,669,597
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Issue date Jun 13, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3655318
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Patent number 3,655,318
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Issue date Apr 11, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3002247
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Patent number 3,002,247
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Issue date Oct 3, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2770864
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Patent number 2,770,864
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Issue date Nov 20, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2751659
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Patent number 2,751,659
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Issue date Jun 26, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2733493
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Patent number 2,733,493
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Issue date Feb 7, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2733494
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Patent number 2,733,494
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Issue date Feb 7, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2627641
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Patent number 2,627,641
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Issue date Feb 10, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2384845
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Patent number 2,384,845
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Issue date Sep 18, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2377666
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Patent number 2,377,666
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Issue date Jun 5, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2377667
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Patent number 2,377,667
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Issue date Jun 5, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2218804
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Patent number 2,218,804
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Issue date Oct 22, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2067716
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Patent number 2,067,716
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Issue date Jan 12, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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2015980
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Patent number 2,015,980
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Issue date Oct 1, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1943477
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Patent number 1,943,477
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Issue date Jan 16, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1912599
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Patent number 1,912,599
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Issue date Jun 6, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1899277
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Patent number 1,899,277
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Issue date Feb 28, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1863114
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Patent number 1,863,114
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Issue date Jun 14, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1859675
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Patent number 1,859,675
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Issue date May 24, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1776666
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Patent number 1,776,666
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Issue date Sep 23, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1775537
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Patent number 1,775,537
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Issue date Sep 9, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE