FIELD: electric engineering. SUBSTANCE: device has posts and joint of the gates. Piezodetectors 1-4 are attached to the gates. Identical detectors 5-20 are disposed inside the area of the gates. Detectors are communicated with control unit electronic circuit which is used for operation of indicator mounted behind the gates if ball gets the joist at first and then bounces into the area of the gates. EFFECT: enhanced reliability. 3 cl, 6 dwg
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Authors
Dates
1994-02-28—Published
1991-12-13—Filed