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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51/00
Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
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A63B51/02
Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear
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