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