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Holohil Systems Ltd.
www.holohil.com (Holohil Systems Ltd. manufactures VHF radio transmitters for wildlife tracking / research).
Also check out their facebook page...http://www.facebook.com/holohil
We use their model R1-2B, 100 week, 15 g units "back pack" style as shown at Http://www.holohil.com/ri2b.htm.
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