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Method of measuring induction of magnetic field
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Method of geophysical prospecting by electric means
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Noise-resistive method of measuring analog signals
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Method of averaging ore quality
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Device for coupling a transverse wave source with ground
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Device for converting seismic signal
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Device for selecting legitimate signal
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Method of well seismic prospecting
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Electrodynamic geophone
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Method of forming dumps
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Digital seismic station
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Well piezoelectric geophone
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Digital phase-sensitive voltmeter
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Self-adjusting three-component geophone
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Method of geoelectric prospecting
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