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Method and device for repairing manhole
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Unlocking system of manhole cover
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Going-out display tag
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Navigation system for passenger
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Opening and closing control system for manhole cover
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Telephone pen for public phone and the public phone utilizing it
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Cutting device
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Sphere cutting method and sphere cutting device
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Buried plug key lid
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Earthquake information processing system
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Electronic lock system
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Locking system of manhole cover and its unlocking method
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