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B60 - VEHICLES IN GENERAL
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B61 - RAILWAYS
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3273672
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3160241
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Patent number 3,160,241
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B61 - RAILWAYS
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3120881
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Patent number 3,120,881
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B60 - VEHICLES IN GENERAL
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1448908
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Patent number 1,442,250
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B61 - RAILWAYS
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1365364
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B61 - RAILWAYS