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1710002
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Patent number 1,710,002
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Issue date Apr 23, 1929
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B61 - RAILWAYS
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1622019
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Patent number 1,622,019
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Issue date Mar 22, 1927
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B61 - RAILWAYS
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1598485
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Patent number 1,598,485
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Issue date Aug 31, 1926
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B61 - RAILWAYS
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1554545
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Patent number 1,554,545
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Issue date Sep 22, 1925
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B61 - RAILWAYS