| http://www.w3.org/ns/prov#value | - If the external source 9 is the environment, it might include such output devices as motors which operate manipulator hands (which could be considered to be the controlled unit 14), valves in hydraulic circuits or innumerable other ways in which the electrical signals 3 alter the environment through mechanical, electrical, thermal, hydraulic or chemical amplification of the electrical output signa
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