means for indicating the halting of {HEAD ~ the actuation} of {TAIL ~ the plurality} of assignable user actuated switches or keys; and 
of
means for indicating the halting of { HEAD ~ the actuation } of { TAIL ~ the plurality } of assignable user actuated switches or keys ; and
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH