| http://www.w3.org/ns/prov#value | - It may, however, be advisable to have the effect of the output not displayed directly in form of a pointer deflection over scale having selected units, but the device 17 may in addition be provided for example with an electrical signal derived from a source 19 of reference signals representing the desired value of the output so 'that the indicator 17 actually is a null instrument showing, i.e., di
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