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