商用 しょうよう電源 でんげん しき計算 けいさん ではありませんでした
shōyōdengen shi kikeisankidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 商用電源式計算器

1. Was not a commercially powered calculator.; Was not a business-use electric calculator.

Past/Perfective
Negative
Polite
Formal Register
Computing