The incremental encoder developed by Nanjing Zhongke Astronomical Instruments Co., Ltd. has been widely used in Nanjing.
Nanjing Zhongke Astronomical Instruments Co., Ltd., formerly known as the Nanjing Astronomical Instruments Research and Development Center (NAIRC) in China, was founded in 1958. It is a research and development base in China that mainly focuses on the development of large and medium-sized astronomical instruments, while also taking into account other integrated optical, electromechanical, and computer technology instruments; According to the requirements of the national science and technology system reform, in December 2001, the company was transformed into a technology enterprise (limited liability company) directly under China *, with employees directly participating in the equity, which increased their risk awareness and sense of responsibility. The company obtained the self operated import and export rights in February 2003, becoming the largest production enterprise in the same industry with self operated import and export qualifications.