On May 4, 1960, Chairman Mao, who was inspecting Shandong, accompanied by Shu Tong and Bai Rubing, visited the Shandong Province Technological Innovation and Technological Revolution Achievements Exhibition.

On May 4, 1960, Chairman Mao, who was inspecting Shandong, accompanied by Shu Tong and Bai Rubing, visited the Shandong Province Technological Innovation and Technological Revolution Achievements Exhibition. Chairman Mao walked into the exhibition hall with enthusiasm and carefully viewed every research result and every innovative product. During the visit, Chairman Mao would sometimes be in front of the booth, listening quietly to explanations or carefully reading explanatory materials. Sometimes he would shake hands cordially with the scientific researchers present and inquire in detail about work conditions and development plans. While looking through "Commune Mathematics" written by mathematicians from Shandong universities and looking at earphone models in front of the medical equipment booth, Chairman Mao stayed for a long time to gain an in-depth understanding of the scientific research situation and pay attention to and support the development of scientific undertakings. After listening to the report, Chairman Mao made many important instructions on Shandong's industrial "four modernizations" (mechanization, semi-mechanization, automation, semi-automation), technological innovation, technological revolution, drought relief and agricultural production. Xinhua News Agency reporter Chen Zhiping, who photographed Chairman Mao at the time, said: "These past events are very precious memories for me. I am very lucky to be able to take pictures of Chairman Mao, who gave me convenience in every aspect and showed a leadership style. These photos are my The most important work in my life. Thinking about it now, it seems like it was not long ago.