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Interlocking device
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Patent number 10,266,189
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Issue date Apr 23, 2019
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East Japan Railway Company
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Kazuhisa Echizen
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B61 - RAILWAYS
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Fail-safe timing circuit
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Patent number 4,150,417
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Issue date Apr 17, 1979
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Westinghouse Air Brake Company
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John O. G. Darrow
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H03 - BASIC ELECTRONIC CIRCUITRY
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3836768
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Patent number 3,836,768
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Issue date Sep 17, 1974
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B61 - RAILWAYS
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3318260
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Patent number 3,318,260
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Issue date May 9, 1967
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B61 - RAILWAYS
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3286091
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Patent number 3,286,091
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Issue date Nov 15, 1966
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B61 - RAILWAYS
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3004151
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Patent number 3,004,151
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Issue date Oct 10, 1961
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B61 - RAILWAYS
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2998514
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Patent number 2,998,514
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Issue date Aug 29, 1961
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B61 - RAILWAYS
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2976403
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Patent number 2,976,403
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Issue date Mar 21, 1961
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B61 - RAILWAYS
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2939111
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Patent number 2,939,111
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Issue date May 31, 1960
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2903572
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Patent number 2,903,572
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Issue date Sep 8, 1959
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B61 - RAILWAYS
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2896068
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Patent number 2,896,068
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Issue date Jul 21, 1959
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B61 - RAILWAYS
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2848602
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Patent number 2,848,602
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Issue date Aug 19, 1958
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B61 - RAILWAYS
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2742563
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Patent number 2,742,563
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Issue date Apr 17, 1956
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B61 - RAILWAYS
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2721932
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Patent number 2,721,932
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Issue date Oct 25, 1955
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B61 - RAILWAYS