bacaan Menghadiahkan praktek tennis patent pencurian Kenya kontras
World Intellectual Property Organization (WIPO) på Twitter: "#TBT to a 1891 “tennis racket” #patent. Might tennis players have used this kind of racket in early editions of the #USOpen? https://t.co/GUmVypvwqV" / Twitter
1927 Tennis Racket Patent Drawing Photograph by Jon Neidert - Pixels