EU Trademark Classification EU07 Machinery Splines (involute -) Class 07 Splines (involute -) 17822 渐开线花键（机器部件） Chinese 渐开线花键（机器部件） English Splines (involute -) [parts of machines] Site ref. 17822 Class 07 Included in Harmonised Database (HDB) Name qualifier parts of machines