油田 ゆでん掘削 くっさく施設 しせつじゃなかったです
yudenkussakushisetsujanakattadesu

Noun
Desu Copula

The polite, past negative form of 油田掘削施設

1. Wasn't an oil drilling facility.

Past/Perfective
Negative
Polite
Casual Register