| http://www.w3.org/ns/prov#value | - For example, the power supply 14 may comprise a conventional signal generator, such as those commercially available from suppliers such as Hewlett-Packard, Palo Alto, Calif., and Tektronics, Portland, Oreg., and a power amplifier, such as those commercially available from suppliers such as ENI, Rochester, N.Y., and Krohn-Hite Corporation, Avon, Mass.
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