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ELECTRICAL AND ELECTROMECHANICAL INSTRUMENTATION SYSTEMS, AND COMPONENTS THEREFOR-NAMELY, PRESSURE TRANSDUCERS OF THE STRAIN-GAUGE TYPE; STRAIN GAUGES; FORCE SENSING DEVICES, NAMELY, PRESTRESS STRAIN GAUGE LOAD CELLS WITH DIGITAL METERS, DIGITAL INDICATORS AND SWITCHING UNITS; LOAD CELLS; ELECTRONIC CRANE SCALE SWIVEL HOOKS WITH RELATED CALIBRATION UNITS, DIGITAL INDICATORS, AND JUNCTION BOXES