Pruning above the reach of pole saws and ladders is desirable in young Douglas-fir, but climbing with the conventional single-spur climbing iron does considerable damage. To minimize this damage the authors invented a climbing iron with several short points set on a curve to fit the tree; this they are parenting for free use in the United States.
Document Type: Journal Article
Formerly junior forester, Pacific Northwest Forest and Range Experiment Station, now in Purchasing Department, Southern Pacific Company
Publication date: May 1, 1949
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