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