How many old factories are there in Mianyang Meifeng?

Mianyang Meifeng Old Factory is an old industrial factory in Mianyang City. Due to historical reasons, there are already several old factories, including Meifeng Old Factory. Specifically, the currently known Mianyang Meifeng Old Factory Area mainly includes the following: 1. Meifeng Old Factory Phase I: Located in Yuhuang Town, Fucheng District, Mianyang City, it is one of the earliest chemical plants in Mianyang City and was built on In the early 1960s, it mainly produced chemical products such as dyes and pigments. 2. Meifeng Old Factory Phase II: Located in the northwest of Baiyang Town, Fucheng District, Mianyang City, it is an expansion area of ??Meifeng Old Factory. It was built in the early 1970s and mainly produces ammonium phosphate, sodium hydroxide, sodium sulfate and other products. . 3. Meifeng Old Factory Phase III: Located in Yuhuang Town, Fucheng District, Mianyang City, it was built in the 1980s and is an expansion area of ??Meifeng Old Factory. It mainly produces plastics, rubber and other products. 4. Meifeng Old Factory Phase IV: Located in Baohua Town, Fucheng District, Mianyang City, it was built in the 1990s and mainly produces polymer materials, dyes, pigments and other products. Old factory areas refer to old industrial areas in cities, usually from the early 20th century to the 1980s and 1990s. At that time, these industrial zones were important industrial supports for urban development and contributed to urban economic and social development. However, with the adjustment of economic structure and the acceleration of urbanization, these old industrial zones gradually lost their appeal and the industry The structure needs to be upgraded, and the building facilities are gradually aging, which has become a difficulty and bottleneck for urban management and development.