{HEAD ~ A timing system} for {TAIL ~ a swimming race} 1, wherein said control device includes a counting circuit for counting a number of swimmers waiting for their turns in relay after getting a first signal from said starting block signal generator generated by diving of a swimmer 
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{ HEAD ~ A timing system } for { TAIL ~ a swimming race } 1 , wherein said control device includes a counting circuit for counting a number of swimmers waiting for their turns in relay after getting a first signal from said starting block signal generator generated by diving of a swimmer
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