sentences:  The PL-5 was designed and developed at China's Luoyang Electro-Optics Technology Development Centre (EOTDC), also known as Institute 612; its design team members included Chen Jiali (陈家礼), Dong Chunfeng, Hu Rongchao (胡荣超), Huang Bin, Zhang Ming (张明), and Zheng Zhiwei (郑志伟).It was reportedly produced at the Hanzhong Nanfeng Machine Factory (also known as the Hanzhong Air-to-Air Missile Factory) of China Aviation Industry Corporation I.The PL-5 have been continuously upgraded by Luoyang and the latest variant, the PL-5EII added a dual band, multi-element detector as well as a laser proximity fuse similar to the PL-9.