EU Trademark Classification EU07 Machinery 活塞环（内燃机部件）（16767） Class 07 Piston rings [internal combustion engine parts] 16767 活塞环（内燃机部件） Chinese 活塞环（内燃机部件） English Piston rings [internal combustion engine parts] Site ref. 16767 Class 07 Included in Harmonised Database (HDB)