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Density; Specific gravity
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CPC
A63B37/0035
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Parent Industries
A
HUMAN NECESSITIES
A63
Sports, games
A63B
APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING BALL GAMES TRAINING EQUIPMENT
A63B37/00
Solid balls; Rigid hollow balls Marbles
Current Industry
A63B37/0035
Density; Specific gravity
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