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Apparatus and method for the electro acoustical measurement of the angular direction of projectiles passing in flight at air-tow-targets

Image Number 2 for United States Patent #5247488.

Apparatus and method for the electro-acoustical measurement of the angle ection of passing projectiles at air-tow-targets, wherein at least three acoustical sensors are equidistantly positioned on a fixed sensor ring which is supported by the tow-target, wherein the arrival times of the waves of the projectiles are electronically measured by means of the several sensors.

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