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System for introducing sunlight into shaded interior by using water running in piping for city water and well water
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Security system of pipe line of petroleum, gas, or the like
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Safety system for pipeline for petroleum and gas
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Leakage portion detection system for underground water service pipe
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Bent connecting rod engine
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Cooling system for swing engine
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Hanging cylindrical part structure for oscillating engine of suspension cylinder
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Oscillating engine with suspended type cylinder
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Power receiving structure for electric car which does not use tower, catenary and pantograph
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Power receiving structure of electric railcar using no steel tower, no trolley wire and no pantograph
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Displaying method for picture and video screen in tunnel
