しゅ制御 せいぎょ機構 きこうじゃありませんでした
shuseigyoki kōja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 主制御機構

1. It was not the main control mechanism.; It wasn't the main control mechanism.

Past/Perfective
Negative
Polite
Terminal Form
Computing