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Issue date Oct 7, 1941
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1876341
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Patent number 1,876,341
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1874447
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1577279
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1577278
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Patent number 1,577,278
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1568678
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Patent number 1,568,678
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1511103
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Patent number 1,511,103
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1392145
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1360268
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1059593
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882696
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832689
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731520
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715124
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681462
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613071
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607334
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592892
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589539
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B61 - RAILWAYS