YOU SAID:

The sharpener has been in continuous use since it was first produced

INTO JAPANESE

シャープナーは最初に製造されてからずっと使用されています

BACK INTO ENGLISH

Sharpener has been in use since it was first manufactured

INTO JAPANESE

シャープナーは最初に製造されてから使用されています

BACK INTO ENGLISH

Sharpener has been used since being manufactured for the first time

INTO JAPANESE

シャープナーは初めて製造されて以来使用されています

BACK INTO ENGLISH

Sharpener has been used since it was manufactured for the first time

INTO JAPANESE

シャープナーは初めて製造されてから使用されています

BACK INTO ENGLISH

Sharpener has been used since it was manufactured for the first time