The safety management patterns for machinery can be approximately divided into three stages from 1949 to present.
The first stage: from 1949 to 1970s later days. In this period, the pattern of safety management for machinery is traditional. Although a few regulations in this period
were made such as works safety and health rules(1956.5.25), several regulations of safety technology for construction and installation(1956.5.25) etc, main management methods were through master workers taking apprentices.