| http://www.w3.org/ns/prov#value | - Referring now to the drawings and particularly to FIG. 1, the level sensing system illustrated includes generally a level sensor 10 according to the invention that would be located in a container such as a tank and which defines a variable resistance as the function of the level of material therein, and a monitor 11 which would provide a visual readout as to the level of the material in the contai
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