<Tr> <Td> <Ul> <Li> Han </Li> <Li> Tang </Li> <Li> Song </Li> <Li> Yuan </Li> <Li> People's Republic <Ul> <Li> agriculture </Li> <Li> space </Li> </Ul> </Li> </Ul> </Td> </Tr> <Ul> <Li> Han </Li> <Li> Tang </Li> <Li> Song </Li> <Li> Yuan </Li> <Li> People's Republic <Ul> <Li> agriculture </Li> <Li> space </Li> </Ul> </Li> </Ul> <Li> People's Republic <Ul> <Li> agriculture </Li> <Li> space </Li> </Ul> </Li> <Ul> <Li> agriculture </Li> <Li> space </Li> </Ul>

Which of the following was not an advancement created during the han dynasty