耐用 たいよう年数 ねんすうではありませんでした
taiyōnensūdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 耐用年数

1. Was not durability.; Was not lifespan.; Was not years of service.

Past/Perfective
Negative
Polite
Formal Register