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Frameless radial truck
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Patent number 4,676,172
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Issue date Jun 30, 1987
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Standard Research and Design Corp.
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Robert L. Bullock
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B61 - RAILWAYS
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2369991
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Patent number 2,369,991
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Issue date Feb 20, 1945
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B61 - RAILWAYS
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1549329
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Patent number 1,549,329
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Issue date Aug 11, 1925
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B61 - RAILWAYS
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1545350
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Patent number 1,545,350
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Issue date Jul 7, 1925
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B61 - RAILWAYS
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1430329
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Patent number 1,430,329
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Issue date Sep 26, 1922
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B61 - RAILWAYS
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1426895
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Patent number 1,426,895
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Issue date Aug 22, 1922
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B61 - RAILWAYS