Title:
EQUIPMENT FOR JUDGING HARDNESS OF TENNIS BALL
Document Type and Number:
Japanese Patent JP2009011787
Kind Code:
A
Abstract:
To provide equipment for easily judging the hardness of a tennis ball which is not a new ball.
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).
Inventors:
FUKUI TAKU
Application Number:
JP2007202342A
Publication Date:
January 22, 2009
Filing Date:
July 05, 2007
Export Citation:
Assignee:
FUKUI TAKU
International Classes:
A63B47/00
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