What is "resistograph"

Resistograph is a trademark characterizing electronic high-resolution needle drill resistance measurement devices, developed by Frank Rinn (since 1986 in Heidelberg/ Germany), for inspecting trees and timber. RESISTOGRAPH® is an internationally registered trademark, characterizing electronic high-resolution needle drill resistance measurement devices, developed by FRANK RINN (since 1986 in Heidelberg/Germany), for inspecting trees and timber.

The name RESISTOGRAPH® was invented by FRANK RINN in 1993 and subsequently registered as a national and international trademark. This trademark exclusively characterizes machines based on his patent on high resolution resistance drilling devices from 1990 and subsequently following patent applications describing further developments.

FRANK RINN holds this registered trademark RESISTOGRAPH® in the following countries:

Australia, Belgium, Bulgaria, China, Cypruss, Chech republic, Denmark, Germany, Estonia, Finland, France, Greece, Great Britain, Hungary, Ireland, Italy, Japan, South-Korea, Croatia, Latvija, Lithuania, Luxemburg, Malta, Netherlands, Austria, Poland, Portugal, Romania, Russia, Sweden, Switzerland, Slovakia, Slovenia, Spain, United States of America.