鉱石 こうせき検波 けんぱ ではありませんでした
kōsekikempakidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 鉱石検波器

1. Was not an ore detector.; Was not a mineral detector.

Past/Perfective
Negative
Polite
Formal Register