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JPS53126568A
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Powdery mayerial mixing apparatus
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JPS53105059A
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Device for automatically discharging sludge in purifying tank
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JPS52148956A
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Nozzle of ejector for aeration apparatus
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JPS52148955A
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Ejector for aeration apparatus
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JPS52124205A
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Variable ejectors
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JPS52105646A
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Water bottom aeration device
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JPS5291556A
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Bottom agitation aeration cylinder
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JPS5249646A
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Dissipating cylinder for sewage-treating apparatus
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JPS5248266A
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Sewage splashing blades
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JPS5238770A
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Instantaneous aeration plant
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JPS5233352A
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Reverse washing device in corculation air exposure tank
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JPS5233351A
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Air bubbles circulating and dispersing device in air exposure tank
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JPS51143934A
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Solar heat absorbing exothermic pipe
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JPS51143933A
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Cushion joint for branch pipe in water heater by solar heat
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