消音 しょうおん装置 そうちではありませんでした
shō onsōchidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 消音装置

1. Was not a silencer.; Was not a muffler.; Was not a soundproofing device.

Past/Perfective
Negative
Polite
Formal Register