To provide {TAIL ~ a mask circuit} in {HEAD ~ a control device} which controls each signal, enables the timing system to exactly perceive a swimmers touch 
To provide { TAIL ~ a mask circuit } in { HEAD ~ a control device } which controls each signal , enables the timing system to exactly perceive a swimmers touch
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH