second announcing means connected to said switch for carrying out said announcement in a second announcement mode only during a predetermined time duration after {HEAD ~ operation} of {TAIL ~ said switch} 
of
second announcing means connected to said switch for carrying out said announcement in a second announcement mode only during a predetermined time duration after { HEAD ~ operation } of { TAIL ~ said switch }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL