1 thought on “The difference between the national standard and factories of the ring screw?”
Paulette
The national standard of the ring screw is produced in accordance with national standards. The factories are produced in accordance with the standards of a certain factory. In addition, the meaning of the factory is not the standard, but it is the mark of the manufacture of the hanging ring bolt factory.
The national standard of the ring screw is produced in accordance with national standards. The factories are produced in accordance with the standards of a certain factory. In addition, the meaning of the factory is not the standard, but it is the mark of the manufacture of the hanging ring bolt factory.