白熱 はくねつ電球 でんきゅうではありませんでした
hakunetsudenkyūdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 白熱電球

1. Was not an incandescent bulb.; Was not a white-hot light bulb.

Past/Perfective
Negative
Polite
Formal Register