FIELD: sports equipment. SUBSTANCE: apparatus has N sources 1 and N radiation receivers 2 positioned in vertical plane, information processing unit 3 and indicator 4. Information processing unit 3 has threshold elements 5, signal selector 6, computer 7. EFFECT: increased efficiency, improved convenience and enhanced reliability in operation. 4 cl, 5 dwg
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Authors
Dates
1996-11-20—Published
1987-04-16—Filed