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Island presence detected
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Patent number 5,924,652
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Issue date Jul 20, 1999
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Harmon Industries, Inc.
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Forrest H. Ballinger
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B61 - RAILWAYS
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Vital wheel detector
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Patent number 5,628,479
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Issue date May 13, 1997
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Harmon Industries, Inc.
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Forrest H. Ballinger
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B61 - RAILWAYS
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Surge arrestor unit
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Patent number 5,436,787
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Issue date Jul 25, 1995
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Harmon Industries, Inc.
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Forrest H. Ballinger
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Crossing control unit
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Patent number 4,934,633
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Issue date Jun 19, 1990
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Harmon Industries, Inc.
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Forrest H. Ballinger
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B61 - RAILWAYS
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