幹線 かんせん結合 けつごう ではありませんでした
kansenketsu gōkidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 幹線結合器

1. Was not a main line coupler.; Was not a trunk line connector.

Past/Perfective
Negative
Polite
Formal Register
Computing