Patent classifications
A
HUMAN NECESSITIES
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A63
SPORTS; GAMES; AMUSEMENTS
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A63B
APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
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37/00
Solid balls; Rigid hollow balls;; Marbles
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A63B37/007
Characteristics of the ball as a whole
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A63B37/0092
Hardness distribution amongst different ball layers
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A63B37/00921
whereby hardness of the cover is higher than hardness of the intermediate layers
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