ผลิตภัณฑ์โลหะ
เอกสารมาตรฐาน
ญี่ปุ่น
JSA
JIS B 0122:1978
Symbols of metal working processes
1978
15
JISh 2022 Std.
This Japanese industrial Standard specifies the symbols used for indicating the working processes, which are generally used after the secondary processes mainly for metals, on the drawings, progress chart, etc.