絶縁 ぜつえん抵抗 ていこうではありませんでした
zetsuenteikōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 絶縁抵抗

1. Was not insulation resistance.; Was not an insulating resistance.

Past/Perfective
Negative
Polite
Formal Register