| http://www.w3.org/ns/prov#value | - This current source is often insufficient for direct transmission, so it is converted to another form or amplified.CONTROLLERS: a few examples of controllers include baffles, control dampers, control valves, filters, lenses, magnetic devices, restrictors, rheostats, variable frequency drives.An important purpose of a controller is to vary, modulate or change a specific characteristic of matter bas
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