What are the "numbers" of commonly used patent country codes?

Austria Austria Australia BE Belgium BR Brazil Canada CH Switzerland CN China CS Czechoslovakia Cczecherepu Blic Czech * * * and China DD East Germany de Germany DK Denmark Denmark EP European Patent Office European Patent Organization Esspin?

1, the code is the source file written by the programmer in the language supported by the development tool, and it is a set of clear rules for representing information in discrete form with characters, symbols or signal symbols.

2. The principles of code design include uniqueness, standardization and universality, expansibility and stability, easy identification and memory, short and unified format and easy modification.