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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A63B31/08
Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs
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A63B31/10
held by, or attachable to, the hands or feet
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A63B31/11
attachable only to the feet
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A63B2031/115
with blade at an angle to the plane of the foot when in use, e.g. to reduce plantar flexion
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A63B2031/117
with blade lying substantially in the body-symmetrical plane, e.g. for breast stroke
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