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FORCE BRIDGE CONTROLS-NAMELY, COMPUTING DEVICES USED IN PNEUMATIC MEASUREMENT OR CONTROL CIRCUITS FOR MANY PURPOSES, SUCH AS TO CONVERT A TRANSMITTED SIGNAL FROM A SQUARE ROOT FLOW METER INTO A LINEAR SIGNAL; TO MAINTAIN A RATIO BETWEEN TWO PNEUMATIC SIGNALS FOR FLOW RATIO CONTROL; TO MULTIPLY, DIVIDE, OR SQUARE PNEUMATIC OUTPUTS; OR TO PROVIDE PRESSURE AND TEMPERATURE COMPENSATION ON TRANSMITTED FLOW SIGNALS