The present invention provides a friction testing machine and method for measuring {HEAD ~ friction characteristics} between {TAIL ~ a test sample} and a friction surface 
between
The present invention provides a friction testing machine and method for measuring { HEAD ~ friction characteristics } between { TAIL ~ a test sample } and a friction surface
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH