http://www.w3.org/ns/prov#value | - The time constants (charging and discharging) of thesecircuit components are such that the D.C. voltage across the capacitor 47 represents the mean pressure sensed by the transducer 20 (FIGS. 1 and 2A-2F) or the noninvasive transducer (in system of FIG. 2G) over a relatively long period, for example during the preceding fifteen (15) minutes or even longer for example a number of hours) or shorter
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