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3631846
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Patent number 3,631,846
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Issue date Jan 4, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3590800
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Patent number 3,590,800
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Issue date Jul 6, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3410259
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Patent number 3,410,259
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Issue date Nov 12, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3384065
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Patent number 3,384,065
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Issue date May 21, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3087483
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Patent number 3,087,483
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Issue date Apr 30, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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2884921
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Patent number 2,884,921
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Issue date May 5, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2710417
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Patent number 2,710,417
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Issue date Jun 14, 1955
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
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2464796
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Patent number 2,464,796
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Issue date Mar 22, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2170783
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Patent number 2,170,783
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Issue date Aug 22, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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1915751
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Patent number 1,915,751
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Issue date Jun 27, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1813014
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Patent number 1,813,014
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Issue date Jul 7, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1622869
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Patent number 1,622,869
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Issue date Mar 29, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1564199
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Patent number 1,564,199
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Issue date Dec 8, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1563081
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Patent number 1,563,081
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Issue date Nov 24, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1554582
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Patent number 1,554,582
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Issue date Sep 22, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1505867
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Patent number 1,505,867
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Issue date Aug 19, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1501195
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Patent number 1,501,195
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Issue date Jul 15, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1496547
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Patent number 1,496,547
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Issue date Jun 3, 1924
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B28 - WORKING CEMENT, CLAY, OR STONE
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1465132
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Patent number 1,465,132
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Issue date Aug 14, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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1446896
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Patent number 1,446,896
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Issue date Feb 27, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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1424719
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Patent number 1,424,719
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Issue date Aug 1, 1922
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B28 - WORKING CEMENT, CLAY, OR STONE
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1397227
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Patent number 1,397,227
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Issue date Nov 15, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE
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1355035
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Patent number 1,355,035
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Issue date Oct 5, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE
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1332038
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Patent number 1,332,038
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Issue date Feb 24, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE