Board Thread:Wikia Discussion/@comment-25683568-20150318062713/@comment-25683568-20150619023436

What numbering doesn't match the dates of introduction?



"In the Meiji and Taisho period, the year an equipment entered service (or was developed) in the japanese calendar was used for the name.

In the Showa period, the lower two digits of the imperial year an equipment entered service (or was developed) in was used."