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3874482
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Patent number 3,874,482
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Issue date Apr 1, 1975
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B60 - VEHICLES IN GENERAL
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3855940
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Patent number 3,855,940
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Issue date Dec 24, 1974
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B60 - VEHICLES IN GENERAL
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3723795
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Patent number 3,723,795
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Issue date Mar 27, 1973
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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3625317
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Patent number 3,625,317
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Issue date Dec 7, 1971
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B61 - RAILWAYS
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3506862
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Patent number 3,506,862
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Issue date Apr 14, 1970
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B60 - VEHICLES IN GENERAL
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3307058
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Patent number 3,307,058
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Issue date Feb 28, 1967
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B61 - RAILWAYS
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2270425
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Patent number 2,270,425
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Issue date Jan 20, 1942
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B61 - RAILWAYS