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Underground mine surveillance system

Communications: electrical – Selective – Having electron beam device
Patent

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Use of periodic signals for continuous wave seismic prospecting

Communications: electrical – Selective – Having electron beam device
Patent

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Variable delay line

Communications: electrical – Selective – Having electron beam device
Patent

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Vehicle detector

Communications: electrical – Selective – Having electron beam device
Patent

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Velocity logger for logging intervals

Communications: electrical – Selective – Having electron beam device
Patent

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Vibrator and processing systems for vibratory seismic operations

Communications: electrical – Selective – Having electron beam device
Patent

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