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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21/00
Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
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A63B21/06
User-manipulated weights
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A63B21/0601
Special physical structures of used masses
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A63B21/0604
Solid masses, e.g. concrete
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