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Linear stepper motor
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Patent number 6,016,021
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Issue date Jan 18, 2000
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Northern Magnetics, Inc.
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Walter E. Hinds
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Linear stepper motor
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Patent number 5,965,962
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Issue date Oct 12, 1999
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Northern Magnetics, Inc.
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Walter E. Hinds
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Linear induction motor systems
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Patent number 4,890,023
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Issue date Dec 26, 1989
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Walter E. Hinds
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Bottom hole oil well pump
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Patent number 4,350,478
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Issue date Sep 21, 1982
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Paul V. Oldershaw
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Linear stepping motor
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Patent number 4,215,283
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Issue date Jul 29, 1980
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Walter E. Hinds
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER