| http://www.w3.org/ns/prov#value | - Ingredients may also be dispensed through an art-disclosed ???duckbill??? valve or another suitable valve associated with each dispensing tip or nozzle, e.g. a one way check valve, ball valve, umbrella valve, flapper valve, or any other one-way valve of the many kinds well known to those skilled in the art that will seal the at reservoir to prevent evaporation and emission when product is not bein
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