真空 しんくう蛍光 けいこう かんじゃありませんでした
shinkūkeiko ukanja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 真空蛍光管

1. It was not a vacuum tube.; It wasn't a vacuum tube.

Past/Perfective
Negative
Polite
Terminal Form