電光 でんこう掲示 けいじ ばんではありませんでした
denkōkeijibandewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 電光掲示板

1. It was not an electronic display board.; It wasn't a digital sign.

Past/Perfective
Negative
Polite
Formal Register