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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A63B21/02
using resilient force-resisters
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A63B21/055
extension element type
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A63B21/0552
Elastic ropes or bands
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A63B21/0557
Details of attachments, e.g. clips or clamps
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