腐食 ふしょく銅版 どうばんじゃなかったです
fushokudōbanjanakattadesu

Noun
Desu Copula

The polite, past negative form of 腐食銅版

1. Wasn't corroding the copper plate.; Wasn't a corroded copper plate.

Past/Perfective
Negative
Polite
Casual Register