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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23/00
Exercising apparatus specially adapted for particular parts of the body
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A63B23/02
for the abdomen, the spinal column or the torso; muscles related to shoulders (e.g. chest muscles)
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A63B23/0233
Muscles of the back, e.g. by an extension of the body against a resistance, reverse crunch
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