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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69/00
Training appliances or apparatus for special sports
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A63B69/40
Stationarily-arranged devices for projecting balls; or other bodies;
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A63B69/406
with rotating discs, wheels or pulleys gripping and propelling the balls or bodies by friction
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