| http://www.w3.org/ns/prov#value | - The time constants (charging and discharging) of these circuit components are such that the D.C. voltage across the capacitor 47 represents the mean pressure sensed by the transducer 20 (FIGS. 1, 2A-2F and 2H-2J) or a 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 s
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