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Lighting device of clock
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Hearing aid
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Voltage drop alarming circuit
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Writing implement with illumination
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Illumination device of timepiece
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Lighting system for clock
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Punch with scale
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Ignition coil fitted with large capacity capacitor
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Electrolytic removing device of metal impurity in aged chromium plating solution
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High speed flexible belt grinder
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Recycle method of zinc cyanide plating liquid
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