Extension and extension pieces for jewelry chains for simple and invisible length change

摘要

Presentation of the protection claims. The feature to be protected is this Manufacture, offering and sale of extension and necklaces that are invisible in style and design, invisible to the necklaces, and producing, offering and selling the combination of necklaces of matching chain and extension chain lengths in accordance with design and design The universal interchangeable fastener system for customers and users who have a need to independently vary the length of their chains by simple manipulations.