先行 せんこう読取 よみとりヘッドじゃなかったです
senkō yomitori heddojanakattadesu

Noun
Desu Copula

The polite, past negative form of 先行読取りヘッド

1. Wasn't the leading read head.; Wasn't the preliminary read head.

Past/Perfective
Negative
Polite
Casual Register
Computing