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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A63B43/00
Balls with special arrangements
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A63B43/04
with an eccentric centre of gravity; with mechanism for changing the centre of gravity
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