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Power quality transducer for use with supervisory control systems
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Coasting power supply for AC power system waveform measuring instrument
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Harmonic-adjusted power factor meter
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High-pass filter for enhancing the resolution of AC power line harmonic measurements
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Harmonic measuring instrument for AC power systems with latched indicator means
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Impulse direction detector for ac power systems
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Method and apparatus for disabling all operations of an electronic instrument except for an automatic test procedure
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Apparatus for digital calibration of detachable transducers
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