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NL8901772A
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Lock with automatic slider.
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NL8901563A
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Threshold construction for rocker.
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NL8802829A
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Automatic sluice gates operated by water level - can be controlled by level on either side of sluice
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AU2326188A
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Mechanical automatic tilting weir with self-adjusting lowering of the weir-level during larger discharges
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NL8702726A
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Grid for automatic weir control valve - has arched, part circular bottom support plate
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NL8702118A
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Adjustable water weir - has hatch tilting on horizontal axis below centre and coupled to upstream floats with counterweights
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