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2639103
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Patent number 2,639,103
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Issue date May 19, 1953
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E21 - EARTH DRILLING MINING
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2624290
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Patent number 2,624,290
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Issue date Jan 6, 1953
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B61 - RAILWAYS
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2560295
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Patent number 2,560,295
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Issue date Jul 10, 1951
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B61 - RAILWAYS
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2306978
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Patent number 2,306,978
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Issue date Dec 29, 1942
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B61 - RAILWAYS
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1628217
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Patent number 1,628,217
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Issue date May 10, 1927
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B61 - RAILWAYS