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