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Railway vehicle detection
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Patent number 8,157,218
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Issue date Apr 17, 2012
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Westinghouse Brake and Signal Holdings Limited
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Charles Edward Riley
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B61 - RAILWAYS
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Railway track circuit
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Patent number 4,467,430
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Issue date Aug 21, 1984
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Compagnie de Signaux et d'Entreprises Electriques
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Andre Even
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B61 - RAILWAYS
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Track monitoring device
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Patent number 4,325,524
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Issue date Apr 20, 1982
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Siemens Aktiengesellschaft
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Adolf Krug
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B61 - RAILWAYS
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3731067
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Patent number 3,731,067
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Issue date May 1, 1973
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B61 - RAILWAYS
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3253254
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Patent number 3,253,254
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Issue date May 24, 1966
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B61 - RAILWAYS
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2970211
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Patent number 2,970,211
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Issue date Jan 31, 1961
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B61 - RAILWAYS
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2334507
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Patent number 2,334,507
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Issue date Nov 16, 1943
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B61 - RAILWAYS
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1821039
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Patent number 1,821,039
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Issue date Sep 1, 1931
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B61 - RAILWAYS