EQUIPMENT FOR JUDGING HARDNESS OF TENNIS BALL

PROBLEM TO BE SOLVED: To provide equipment for easily judging the hardness of a tennis ball which is not a new ball. SOLUTION: The equipment comprises: a fixed holding board (1); and a pressure board (2) attached to a piston (3) to which force is added by a pressure spring (4). COPYRIGHT: (C)2009,JP...

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Bibliographische Detailangaben
1. Verfasser:	FUKUI TAKU
Format:	Patent
Sprache:	eng
Schlagworte:	AMUSEMENTS APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING,CLIMBING, OR FENCING BALL GAMES GAMES HUMAN NECESSITIES SPORTS TRAINING EQUIPMENT
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide equipment for easily judging the hardness of a tennis ball which is not a new ball. SOLUTION: The equipment comprises: a fixed holding board (1); and a pressure board (2) attached to a piston (3) to which force is added by a pressure spring (4). COPYRIGHT: (C)2009,JPO&INPIT