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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Tanaka; Yoshihisa
Address:
Tokyo, JP
No. of patents:
2
Patents:












Patent Number Title Of Patent Date Issued
4819941 Device for determining swing speed of rotatable implements April 11, 1989
A device for determining swing speed of a rotatable sporting goods implement, for example human activated sporting goods i.e. a baseball bat or a golf club, wherein practice swings are undertaken seriatim. The device is comprised of a base mounted support for a rotatable screw shaft,
4788863 Device for determining swing speed of rotatable implements December 6, 1988
A device for determining swing speed of rotatable implements, for example human activated sporting goods such as a bat, a tennis racquet, etc. The device comprises a mounting base, a magnetically attractable arcuately movable member in the form of a metal plate, a stopper, the movable me










 
 
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