Tree trimming equipment
Here are some examples of tree pruning equipment
http://about.pricegrabber.com/search_attrib.php?page_id=1105&form_keyword=tree+pruner&rd=1
Tree pruner (I have one like this)
http://about.pricegrabber.com/search_getprod.php/masterid=3167676/search=tree+pruner
Apparently the industry is moving toward mechanized tree pruning equipment, with small motors, either electric or gasoline powered. Best to get fiberglass pole, which is lighter than wood, and does not conduct electricity like a metal pole (assuming one is trimming around power lines).