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Power factor regulating apparatus
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Circuit control apparatus
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Power factor controlling apparatus
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Electric regulating apparatus
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Adjustable constant-current control system
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Constant current regulator
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Electric control system
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Electric control system
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Electric regulating apparatus
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Automatic rectifying device
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Electric regulating apparatus
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Electric regulating circuit
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Constant current control
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Greaseproof composition
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CA431516A
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Fibrous material coating
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