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