自動 じどう膨張 ぼうちょう しきじゃなかったです
jidōbōchō shikijanakattadesu

Noun
Desu Copula

The polite, past negative form of 自動膨張式

1. Wasn't self-inflating.; Wasn't automatic inflation.

Past/Perfective
Negative
Polite
Casual Register