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25 Dec 2009
Patent Awarded for Novel Tree-Ring Pen
Tree Ring Pens Co. manufactures the Tree Ring Pen and other tree ring chronology products. U.S. Patent ...

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Tree Ring Pens - Ecology, History and Forest Restoration
Missoula, Montana
Ph (406) 493 - 1490
TreeRingPens@gmail.com
www.TreeRingPens.com
Patent US - 7467904
 

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