| http://www.w3.org/ns/prov#value | - The device is comprised of a vessel such as a drinking cup or a container such as a bottle, an inner cup of a predetermined size, a tube fixed to the inner cup and extending to the upper end of the cup or container wherein the tube is fixed to the top of the cup or container and wherein a limited volume of fluid may enter the inner cup or container and wherein when the drinking cup or container is
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