Input (grade 8): One of oldest known depiction of a stern-mounted rudder in China can be seen on a 2 ft. long tomb pottery model of a junk dating from the 1st century AD, during the Han Dynasty (202 BC-220 AD).
Output (grade 8): One of the world's oldest known image of a stern-mounted rudder can be seen on a 2 ft. long tomb pottery model of a Chinese junk that dates from the 1st century CE, during the Han Dynasty (202 BC-220 AD).