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Validity signal apparatus for monitoring a line boundary
Validity signal apparatus for monitoring a line boundary
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机译:用于监视线边界的有效性信号装置
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摘要
Apparatus for determining the validity of a kill shot in racketball or handball, or the like, or of an "out" ball in tennis includes light beam arrays and the interruption of one or more light beams and the timing involved in the interruption is used to provide an appropriate signal.
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