| http://www.w3.org/ns/prov#value | - For more information on such devices as are described above, and referred to hereinafter, reference may be made to the abovementioned U.S. Pat. No. 3,760,374 to Nabi, as well as to U.S. Pat. No. 3,895,380 to Peterson, and U.S. Pat. No. 3,582,621 to Lawler, all of which disclose exemplary prior art devices.
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