guiding means in said housing for guiding each of said push buttons for {HEAD ~ sliding movement} in {TAIL ~ a predetermined direction} between forwardly extended and rearwardly depressed positions, 
in
guiding means in said housing for guiding each of said push buttons for { HEAD ~ sliding movement } in { TAIL ~ a predetermined direction } between forwardly extended and rearwardly depressed positions ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH