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2208685
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Patent number 2,208,685
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Issue date Jul 23, 1940
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B61 - RAILWAYS
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1806129
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Patent number 1,806,129
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Issue date May 19, 1931
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B61 - RAILWAYS
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1758018
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Patent number 1,758,018
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B61 - RAILWAYS
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1430412
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Patent number 1,430,412
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Issue date Sep 26, 1922
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B61 - RAILWAYS
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1351946
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Patent number 1,351,946
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B61 - RAILWAYS