WOLFRAM SYSTEM MODELER
    FourPortModel with four connectors  | 
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SystemModel["Hydraulic.Interfaces.FourPort"]

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         Hydraulic.Valves.DirectionalControl.Internal Partial valve with six ports and three states  | 
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         Hydraulic.Valves.DirectionalControl.Internal Partial valve with four ports and three states  | 
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         Hydraulic.Valves.DirectionalControl.Internal Partial valve with four ports and three states  | 
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         Hydraulic.Valves.DirectionalControl.Internal Partial valve with four ports and three states  | 
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         Hydraulic.Valves.DirectionalControl.Internal Partial valve with four ports and three states  | 
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         Hydraulic.Valves.DirectionalControl.Internal Partial valve with four ports and three states  | 
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         Hydraulic.Valves.DirectionalControl.Internal Partial valve with four ports and two states  | 
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         Hydraulic.Valves.DirectionalControl.Internal.States Basic building block for directional control valves  | 
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         Hydraulic.Valves.DirectionalControl.Internal.States Basic building block for directional control valves  | 
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         Hydraulic.Valves.DirectionalControl.Internal.States Basic building block for directional control valves  | 
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         Hydraulic.Valves.DirectionalControl.Internal.States Basic building block for directional control valves  | 
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         Hydraulic.Valves.DirectionalControl.Internal.States Basic building block for directional control valves  | 
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         Hydraulic.Valves.DirectionalControl.Internal.States Basic building block for directional control valves  |