Heilongjiang is the forward position of the northern front, especially the border areas, which bear the brunt of the war. Many arsenals were moved to the rear. At the end of 1969, the factory relocation plan began to be implemented in an orderly manner.

After the Zhenbao Island incident, the situation was grim. In order to implement the central government's instructions of "preparing for famine, preparing for war, and serving the people" and preparing for a big war, various localities also stepped up the pace of building the third line . Heilongjiang is the forward position of the northern front, especially the border areas, which bear the brunt of the war. Many arsenals were moved to the rear. At the end of 1969, the factory relocation plan began to be implemented in an orderly manner. The sky is monitored by the satellite of the powerful northern country. All large objects are moved, and the operations are carried out in a state of secrecy. The third-line construction is extremely mysterious, so that many people do not know this period of history.

One day in December 1969, a veteran who had participated in the to resist U.S. aggression and aid Korea led a team of more than 10 people, guided by villagers, to the Houzhangzi Brigade at the junction of Daolden Commune and Nansonglingzi, and saw the surrounding mountains. , the alluvial accumulation of small rivers forms a 6.5-kilometer, S-shaped small ravine. The guide led the small team to go for a spin on the mountain. After looking around with the telescope for a week, the veteran said with satisfaction that "it's powerful." The guide asked puzzledly, "What are you talking about?" One team member replied to the guide, "This is foreign language." The guide thought to himself : The level of fighting abroad is high. In order to thank the guide, the veteran generously donated two bottles of Niulanshan to the guide and asked him to keep it secret.

After inspecting the address, the team reported to their superiors. The superiors sent people to inspect several more times and determined that an arsenal would be built in this small ravine. In February 1972, the engineering team stationed in Houzhangzi, and the vigorous construction battle officially started. In order to speed up the construction progress, the engineering headquarters asked the local government for help. The local armed forces set up a migrant worker battalion in a short period of time to participate in the construction team. However, the time was tight and the tasks were heavy. The project headquarters decided to build the factory building first, and then build the staff dormitories and other supporting facilities. This was what was said at the time: "Production first, life later" "Construction policy.

The factory building was completed in less than half a year. Immediately afterwards, a large number of equipment was moved to the factory one after another. Full-time personnel immediately installed the equipment and technicians debugged the equipment. Within two days, a complete production line entered the trial production state of the product. These equipments are all belongings from the Mudanjiang Tool Factory. After the Mudanjiang Tool Factory moved to Houzhangzi, it was renamed the State-owned Northern Machinery Factory. There is also a mysterious number code 5521 due to its military background.

Construction started in February 1970 and the project was delivered for use in 1971. It took more than a year to complete the factory covering an area of ​​440,000 square meters and a construction area of ​​100,000 square meters in a short time. One cannot but sigh at the speed of China. More than 1,000 pieces of equipment were moved in more than half a year, and the relocation was carried out under confidentiality. The factory was producing military products less than half a year after its establishment. This also reflects how severe the situation was back then.

Northern Machinery Factory mainly produces 14.5mm anti-aircraft machine gun bullets, armor-piercing bullets, incendiary bombs and other military products. Anti-aircraft machine gun bullets are mainly used for air defense, armor-piercing bullets are mainly used for military special vehicles, and incendiary bombs are mainly used for ambush warfare. Judging from the military products produced by the Northern Machinery Factory, they are mainly used to deal with enemy fighters and special vehicles.

At the beginning of the establishment of the factory, there were more than 1,400 employees in the Northern Machinery Factory, most of whom came from the Mudanjiang Tool Factory, as well as a small number of demobilized soldiers and migrant workers, as well as local educated youth. The nature of the military industry of Northern Machinery Factory also determines its recruitment review mechanism. Employees must undergo political review before joining, and the previous three generations will be traced. If the previous three generations have bad records, they will be rejected. There was also a written qualitative principle at that time. If the three generations of ancestors were poor peasants and had a good political outlook, and the ancestors were born in a landlord family, the four characters "landlord family" would be written on the household registration book. It was even more serious than today when deserters are marked as objecting to military service in the household registration book.

The Northern Factory, like many state-owned factories, has an independent living space, an independent material transportation team, and an independent material supply chain. There are supporting facilities such as employee dormitories, canteens, bathhouses, shops, schools, cinemas, auditoriums, guest houses, etc. in the factory area. The entire factory area is under militarized management, and the production area is a military restricted area. No one is allowed to enter the factory without a special pass. If an employee loses his pass, he will be turned away. Nofi has leaders to guarantee it.

History is so dramatic. Just when they were preparing to fight a powerful opponent, Big Brother and the United States actually started to play Cold War . What is incredible is that they played the Cold War to the end, and finally ended with the disbandment of Big Brother. . The Cold War played by the two powers brought a rare peaceful environment to our country. Especially after the self-defense counterattack against Vietnam, our country's situation was very good. For this reason, our country began to implement reform and opening up. The arsenals built in preparation for war also saw a decrease in military product orders due to the cancellation of war preparations. In order to revitalize the half-dead arsenals, the central government allowed some arsenals to convert production.

The Northern Factory began to convert from military to civilian after 1980. It once produced civilian products such as washing machines, electric irons, electroplated folding chairs , and hard aluminum alloys. After 1985, with the improvement of the international situation in China, the factories originally built in mountainous areas began to be relocated to Chaoyang City in 1987 due to factors such as inconvenient transportation, poor information, and high operating costs. In 1988, the relocation of the factory was completed, and the remaining Assets are placed under management. After the living area of ​​4,000 people was moved away, the small ravine in Houzhangzi returned to its original tranquility. Most of the buildings in the factory area today are idle, and a few are used by private companies and villagers. When the Northern Factory was moved, it also completed its third-line construction task.

This article is a narrative manuscript. I see things and talk about them. I see what I think and write what I think. If there are any mistakes, please forgive me. Thank you to the readers for reading this article and please give us your constructive comments. Original article, plagiarism will be investigated.