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Vented pneumatic foot controller
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Patent number 4,413,214
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Issue date Nov 1, 1983
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The Singer Company
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Jack Brown
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F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
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Full wave motor control circuit
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Patent number 4,390,824
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Issue date Jun 28, 1983
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The Singer Company
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Jack Brown
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Motor braking arrangement
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Patent number 4,243,919
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Issue date Jan 6, 1981
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The Singer Company
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Jack Brown
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Low voltage power transformer
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Patent number 4,000,483
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Issue date Dec 28, 1976
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The Singer Company
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Albert Norman Cook
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H01 - BASIC ELECTRIC ELEMENTS