无产阶级文化大革命以前,我处的混凝土搅拌机型号繁多,有天津、上海、本溪等地生产的近10种机型共77台,几乎国内的各种机型均有。由于机型繁多,给维修工作带来很大困难。突出的矛盾就是配件不易制造和储备,在机械大修时往往因为配件供应不上,长期修不 Before the proletarian cultural revolution, there were many types of concrete mixers at our office. There were 77 types of nearly 10 kinds of machines produced in Tianjin, Shanghai, and Benxi, and almost all domestic models were available. Due to the large number of models, it has brought great difficulties to maintenance work. The outstanding contradiction is that it is not easy to manufacture and store spare parts. When the machinery is overhauled, it is often because the accessories are not supplied.