Ma Hengchang (马恒昌, 1908-1985) was a famous model worker in the early 1950s. He worked at the Machinery Factory nr 5 in Shenyang (Liaoning), and surpassed the production goals set to his team in the context of the 'Patriotic Labor Competition' supporting the Korean War.
The man in the main image is Ma, the six small images show the main principles of his method.