The standard applies to each series of products in the JB/Z 117-75 industrial and mining electric locomotive series spectrum, and serves as a unified regulation for determining product models.
JB/T 2933-1981 history
2007JB/T 2933-2007 Drawing-up aud management methods of mine electric locomotive models
1981JB/T 2933-1981 Model preparation method of industrial and mining electric locomotives