EU Trademark Classification EU01 Chemicals Internal combustion engines (Antiknock substances for -) Class 01 Internal combustion engines (Antiknock substances for -) 3391 内燃机用抗爆物质 Chinese 内燃机用抗爆物质 English Internal combustion engines (Antiknock substances for -) Site ref. 3391 Class 01 Included in Harmonised Database (HDB)