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Liquid purification apparatus
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Slow filter
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Casette filter for water purification against iron
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Plant for deironing of underground waters
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Amelioration system
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Method for planning field surface of land-reclamation system
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Rice growing method
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Method for levelling field surface in amelioration system
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Working member of ripper
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Rotor-type aerator
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Ground water recharge method
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Trench machine
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Soil-tilling implement working member
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Device for control of level in tail race
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Method of boggy weed control of rice field
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Method of planning field surface of reclamation system
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Device for magnetization of irrigation water
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Earth-moving machine working equipment
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Method of planting rice-growing plots with protection of canal against silting
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Working member for laying drains
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