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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39/00
Hollow non-inflatable balls; , i.e. having no valves
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A63B39/02
Arrangements for maintaining the pressure
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A63B39/025
using containers with pressurising means for balls not in use
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