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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A63B37/0038
Intermediate layers, e.g. inner cover, outer core, mantle
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A63B37/0047
Density; Specific gravity
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