The signal lamps 3 for a swimmer is equipped at a starting block 4 which is provided at {HEAD ~ the starting side} of a swimming pool 1 so as to project at {TAIL ~ the front} of the starting block 4 
to project at
The signal lamps 3 for a swimmer is equipped at a starting block 4 which is provided at { HEAD ~ the starting side } of a swimming pool 1 so as to project at { TAIL ~ the front } of the starting block 4
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH