看板 かんばん方式 ほうしきじゃなかったです
kambanhōshikijanakattadesu

Noun
Desu Copula

The polite, past negative form of 看板方式

1. Wasn't a notice/bulletin board style.; Wasn't done using a notice/bulletin board.

Past/Perfective
Negative
Polite
Casual Register