Title:
SOFTBALL PRESSURE-MEASURING INSTRUMENT
Document Type and Number:
Japanese Patent JP2001091391
Kind Code:
A
Abstract:
To manufacture a measuring instrument for eliminating a problem in a formal game where the hardness of balls vary greatly during the play of soft-ball tennis and soft-ball volleyball.
The balls of soft-ball tennis and soft-ball volleyball are placed at a ball catch 3 and are pressed by pulling ball pressers 4 and 38 and using springs 10 and 21, thus enabling a measurement needle to measure a current air pressure.
Inventors:
TAKADA TSUKIO
Application Number:
JP30746299A
Publication Date:
April 06, 2001
Filing Date:
September 22, 1999
Export Citation:
Assignee:
TAKADA TSUKIO
International Classes:
A63B41/00; A63B47/00; G01L17/00; (IPC1-7): G01L17/00