硝酸 しょうさん繊維 せんい ではありませんでした
shōsansen'isodewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 硝酸繊維素

1. Was not cellulose nitrate.; Was not nitrocellulose.

Past/Perfective
Negative
Polite
Formal Register