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ES112464A1
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Automatic complementary damper for sliding gates or reservoir organs.
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ES104782A1
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Automatic regulation mechanism for hydraulically operated gates.
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US1382132A
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Movable dam of ferroconcrete
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US1363820A
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Automatic segment-weir
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DE339297C
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Drum weir
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DE339296C
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Automatic device for adjusting a defensive body by means of a cylinder gun
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US952725A
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Automatic valve or gate for weirs or the like.
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CA218275A
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Movable dam
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DE360482C
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Self-regulating drum weir
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DE351521C
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Automatic segment weir with horizontal axis of rotation
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