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3927735
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Patent number 3,927,735
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Issue date Dec 23, 1975
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B60 - VEHICLES IN GENERAL
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3921535
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Patent number 3,921,535
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Issue date Nov 25, 1975
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B60 - VEHICLES IN GENERAL
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3905303
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Patent number 3,905,303
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Issue date Sep 16, 1975
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3903809
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Patent number 3,903,809
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Issue date Sep 9, 1975
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B60 - VEHICLES IN GENERAL
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3861320
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Patent number 3,861,320
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Issue date Jan 21, 1975
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B61 - RAILWAYS
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3858521
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Patent number 3,858,521
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Issue date Jan 7, 1975
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B60 - VEHICLES IN GENERAL