ORGANIZATION@1 , LOCATION@1 On May NUMBER@1 , NUMBER@2 , PERSON@1 and PERSON@2 received LOCATION@2 patent # NUMBER@3 for using copper rivets to strengthen the pockets of denim work pants .

On May NUMBER@1 , NUMBER@2 , PERSON@1 and PERSON@3 received LOCATION@2 patent # NUMBER@3 for using copper rivets to strengthen the pockets of denim work pants .
