| http://www.w3.org/ns/prov#value | - It is obvious that in a device including sensors for detecting a golf club head near an impact point, and a display for amplifying the signals and converting them to indicate the distance travelled by a hit golf ball as well as the velocity of the ball and the like, the components, i.e., the sensors, etc., must be reliable over a long period of time to increase the precision of the device.
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