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