Ryder instrument and equipment ltd. Of the city of zhuyi is registered at the southern ring road (in the printing plant) in the city of zhuyi. The registration authority is the monitoring and management office of the zhu yi street markets of the city of zhuyi, represented by legal persons, and operates in the following areas: production: teaching equipment; import and export of goods and technology (except for goods and technologies which are authorized by national laws and regulations to operate or whose import and export is prohibited)。