Hou Quanchen introduces Kong Ming Locks to the visitors in Shahe City, north China's Hebei Province on Nov. 28, 2018. Hou Quanchen, who is in his seventies, has devoted himself in the studying and making of Kong Ming Locks and has tried to promote this art among local residents ever since his retirement. (Xinhua/Tian Xiaoli)
Hou Quanchen introduces Kong Ming Locks to the visitors in Shahe City, north China's Hebei Province on Nov. 28, 2018. Hou Quanchen, who is in his seventies, has devoted himself in the studying and making of Kong Ming Locks and has tried to promote this art among local residents ever since his retirement. (Xinhua/Tian Xiaoli)
Hou Quanchen designs a Kong Ming Lock in Shahe City, north China's Hebei Province on Nov. 28, 2018. Hou Quanchen, who is in his seventies, has devoted himself in the studying and making of Kong Ming Locks and has tried to promote this art among local residents ever since his retirement. (Xinhua/Tian Xiaoli)
Hou Quanchen makes a Kong Ming Lock in Shahe City, north China's Hebei Province on Nov. 28, 2018. Hou Quanchen, who is in his seventies, has devoted himself in the studying and making of Kong Ming Locks and has tried to promote this art among local residents ever since his retirement. (Xinhua/Tian Xiaoli)
Hou Quanchen designs a Kong Ming Lock in Shahe City, north China's Hebei Province on Nov. 28, 2018. Hou Quanchen, who is in his seventies, has devoted himself in the studying and making of Kong Ming Locks and has tried to promote this art among local residents ever since his retirement. (Xinhua/Tian Xiaoli)
Hou Quanchen shows his self-made Kong Ming Locks in Shahe City, north China's Hebei Province on Nov. 28, 2018. Hou Quanchen, who is in his seventies, has devoted himself in the studying and making of Kong Ming Locks and has tried to promote this art among local residents ever since his retirement. (Xinhua/Tian Xiaoli)