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3892188
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Patent number 3,892,188
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Issue date Jul 1, 1975
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B61 - RAILWAYS
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3874308
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Patent number 3,874,308
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Issue date Apr 1, 1975
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B60 - VEHICLES IN GENERAL
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3584584
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Patent number 3,584,584
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Issue date Jun 15, 1971
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B61 - RAILWAYS
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3557712
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Patent number 3,557,712
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Issue date Jan 26, 1971
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B61 - RAILWAYS
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3503340
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Patent number 3,503,340
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Issue date Mar 31, 1970
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B61 - RAILWAYS
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3285194
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Patent number 3,285,194
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Issue date Nov 15, 1966
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B61 - RAILWAYS
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3228352
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Patent number 3,228,352
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Issue date Jan 11, 1966
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B61 - RAILWAYS
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2211469
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Patent number 2,211,469
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Issue date Aug 13, 1940
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B61 - RAILWAYS