http://www.msha.gov/techsupp/PEDLoca...
MSHA Approved Communications & Tracking Technologies
Revised September 30, 2008
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Wireless Mesh Communications and/or Tracking Systems
Manufacturer
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Model Number
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Product Type
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Approval #
Innovative Wireless Technologies, Inc.
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Sentinel
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Wireless Mesh Communication System
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23-A080016-0