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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+VLF\s+\"Through\s+the\s+Earth\"\s+Comms\s*$/: 1 ]

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1. LF: VLF "Through the Earth" Comms (score: 1)
Author: Warren Ziegler <[email protected]>
Date: Wed, 9 Jan 2013 22:46:59 -0500
A friend of mine who does caving pointed me to a company that makes VLF equipment for use in mines, railway tunnels etc. It operates in the 400Hz-8kHz range. If interested take a look at their web pa
/rsgb_lf_group-archives/html/rsgb_lf_group/2013-01/msg00358.html (9,077 bytes)

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