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1443706
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Patent number 1,443,706
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Issue date Jan 30, 1923
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B61 - RAILWAYS
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1424693
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Patent number 1,424,693
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Issue date Aug 1, 1922
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1400057
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Patent number 1,400,057
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Issue date Dec 13, 1921
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B61 - RAILWAYS
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1343727
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Patent number 1,343,727
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Issue date Jun 15, 1920
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B61 - RAILWAYS