配管 はいかん工業 こうぎょうじゃありませんでした
wa ikan kōgyōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 配管工業

1. Was not a plumbing industry worker.; Was not related to the plumbing industry.

Past/Perfective
Negative
Polite
Terminal Form