| http://www.w3.org/ns/prov#value | - Alternatively, the ball, plunger, or other article can always be partially visible, and include portions corresponding to proper fluid flow, such as green for proper fluid flow and red for no fluid flow, whereby fluid flow causing movement of the ball, plunger, or other article against the spring bias would change the portion of the ball, plunger, or other article visible to the operator through t
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