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11/1/1981 - Reports of InvestigationsThis report discusses the configuration and system deployment for the postdisaster surface seismic system for detecting and locating trapped miners.
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7/14/1974 - Contract reportsThis report describes a circuit for driving a low-frequency loop antenna from a miners cap lamp battery. The circuit is a miniature waveform generator and is part of the electromagnetic (em) trapped miner location system. Two engineering models were des...
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Content source: National Institute for Occupational Safety and Health, Mining Program