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Lift and line beam extension
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Patent number 4,203,367
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Issue date May 20, 1980
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Canron Corp.
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John K. Stewart
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3472174
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Patent number 3,472,174
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Issue date Oct 14, 1969
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3472173
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Patent number 3,472,173
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Issue date Oct 14, 1969
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3444822
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Patent number 3,444,822
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Issue date May 20, 1969
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3170410
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Patent number 3,170,410
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Issue date Feb 23, 1965
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1730029
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Patent number 1,730,029
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Issue date Oct 1, 1929
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES