Answer:

Germany: Ston, Zwilling, Japanese KAI, Kaiyin?

Domestic: Boyou, Very Small Device, Japan and the United States , Korea has Kowell, Kewell

(1) Nail clippers were invented by foreigners in the 20th century. The principle should come from scissors + file. This is a very simple leverage principle. The leverage principle basically has There are 3 types of levers. Examples of the first type of levers are balances, scissors, pliers, etc. Examples of the second type of levers are corkscrews and nutcrackers. Examples of the third type of levers are hammers, tweezers, etc. In the past, when there were no nail clippers, people used scissors to cut or grind their long nails. Nail clippers were a convenient invention that benefited mankind. Blessed the whole world.

(2) The new nail clipper industry standards are revised to clean up the mud, rectify the market, and standardize order, thereby improving the technical content and quality level of my country's nail clipper products and ensuring the healthy development of the entire industry.

(3) Compared with the old standard, the new standard has mainly changed in the following technical contents: the requirements for the hardness of the jaws, the corrosion resistance of the coating, and the mouth spacing have been improved, and the requirements for the jaws have been increased. Requirements for the metallographic structure of the hardened layer and the durability of the jaws. In addition, the "product classification" and "inspection rules" in the original standard have also been modified.