| http://www.w3.org/ns/prov#value | - In combination with a livestock watering trough and a demand water supply system for refilling said trough when needed, said system including a source of pressuriz-ed water and a conduit from said source to said trough: additive-dispensing apparatus including: a mixing tank in said conduit upstream from said trough, an additive supply source above said tank, additive-dispensing means beneath said
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