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Light converging device using condenser lens, accumulating device for light energy converted by same light converging device, production of gas using same accumulating device, separating method for gas produced by same production, alga cultivating method using carbon dioxide left after separating by same separating method for gas, keeping method for fresh water fish using algas cultivated by same alga cultivating method, manufacture of fuel using algas cultivated by same alga cultivating method, manufacture of manure using algas cultivated by same alga cultivating method, manufacture of chemicals using algas cultivated by same alga cultivating method, manufacture of processed food using algas cultivated by same alga cultivating method, manufacture of proessed food using fresh fish bred by same keeping method for fresh fish, and light collecting method using condenser lens
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Method of constructing high earthquake resistant block fence which is lightweight and easily assembled
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Construction method of curved surface in laying brick
