{HEAD ~ A friction damper} provides friction damping for gas turbine engine airfoils to reduce {TAIL ~ vibrations} thereto 
{ HEAD ~ A friction damper } provides friction damping for gas turbine engine airfoils to reduce { TAIL ~ vibrations } thereto
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH