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3877641
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Patent number 3,877,641
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Issue date Apr 15, 1975
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2296076
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Patent number 2,296,076
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Issue date Sep 15, 1942
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2294860
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Patent number 2,294,860
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Issue date Sep 1, 1942
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2160310
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Patent number 2,160,310
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Issue date May 30, 1939
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2143766
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Patent number 2,143,766
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Issue date Jan 10, 1939
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2104165
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Patent number 2,104,165
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Issue date Jan 4, 1938
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2089634
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Patent number 2,089,634
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Issue date Aug 10, 1937
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2079533
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Patent number 2,079,533
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Issue date May 4, 1937
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2013228
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Patent number 2,013,228
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Issue date Sep 3, 1935
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1856358
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Patent number 1,856,358
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Issue date May 3, 1932
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1854361
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Patent number 1,854,361
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Issue date Apr 19, 1932
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1850805
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Patent number 1,850,805
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Issue date Mar 22, 1932
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1827840
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Patent number 1,827,840
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Issue date Oct 20, 1931
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1823745
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Patent number 1,823,745
-
Issue date Sep 15, 1931
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1766888
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Patent number 1,766,888
-
Issue date Jun 24, 1930
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1750775
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Patent number 1,750,775
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Issue date Mar 18, 1930
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1709143
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Patent number 1,709,143
-
Issue date Apr 16, 1929
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1697844
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Patent number 1,697,844
-
Issue date Jan 8, 1929
-
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1652850
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Patent number 1,652,850
-
Issue date Dec 13, 1927
-
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1629996
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Patent number 1,629,996
-
Issue date May 24, 1927
-
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1578166
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Patent number 1,578,166
-
Issue date Mar 23, 1926
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1575394
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Patent number 1,575,394
-
Issue date Mar 2, 1926
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1565197
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Patent number 1,565,197
-
Issue date Dec 8, 1925
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1468926
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Patent number 1,468,926
-
Issue date Sep 25, 1923
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1455695
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Patent number 1,455,695
-
Issue date May 15, 1923
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1425736
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Patent number 1,425,736
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Issue date Aug 15, 1922
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1413765
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Patent number 1,413,765
-
Issue date Apr 25, 1922
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1403938
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Patent number 1,403,938
-
Issue date Jan 17, 1922
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1397107
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Patent number 1,397,107
-
Issue date Nov 15, 1921
-
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1383074
-
Patent number 1,383,074
-
Issue date Jun 28, 1921
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES