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Support system for a railroad track
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Patent number 4,494,694
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Issue date Jan 22, 1985
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Iowa State University Research Foundation, Inc.
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John M. Pitt
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2452196
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Patent number 2,452,196
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Issue date Oct 26, 1948
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2357769
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Patent number 2,357,769
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Issue date Sep 5, 1944
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2160399
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Patent number 2,160,399
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Issue date May 30, 1939
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2149957
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Patent number 2,149,957
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Issue date Mar 7, 1939
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1778574
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Patent number 1,778,574
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Issue date Oct 14, 1930
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1770155
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Patent number 1,770,155
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Issue date Jul 8, 1930
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1633211
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Patent number 1,633,211
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Issue date Jun 21, 1927
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES