Is Nissin Seiki a state-owned enterprise or a central enterprise?

Neither. Central enterprises refer to the Central People's Government (the State Council) or the state-owned assets supervision and administration institutions entrusted to exercise the responsibilities of investors. State-owned enterprises refer to enterprises with more than 50% state-owned shares, and Nissin Precision Machinery refers to Zhejiang Nissin Precision Machinery Co., Ltd., with four people 100% holding shares, so it does not belong to state-owned enterprises or central enterprises.