Timing and lap counting device for a swimmer

Swim/sporting event timer/counter. A waterproof housing has upwardly projecting digital displays and two spaced ultrasonic receivers. A swimmer wears an ultrasonic transmitter tuned to ultrasonic receivers. by measuring the time differential for the ultrasonic signals from the transmitter to reach t...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	LURKER, DEAN, MITCHELL, DAVID E
Format:	Patent
Sprache:	eng
Schlagworte:	HOROLOGY PHYSICS TIME-INTERVAL MEASURING
Online-Zugang:	Volltext bestellen
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