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Frequency converter apparatus
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Patent number 4,378,587
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Issue date Mar 29, 1983
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ESCO Manufacturing Company
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James E. McClain
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Regulator-compensator control
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Patent number 4,288,737
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Issue date Sep 8, 1981
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Esco Manufacturing Company
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James E. McClain
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G05 - CONTROLLING REGULATING
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Protection of polyphase equipment
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Patent number RE30134
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Issue date Oct 30, 1979
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ESCO Manufacturing Company
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James E. McClain
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361 - Electricity: electrical systems and devices
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Protection of polyphase equipment
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Patent number 4,024,439
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Issue date May 17, 1977
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ESCO Manufacturing Company
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James E. McClain
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER