This part is a kind of semiconductor called NJM2058.

Function of this product has QUAD OPERATIONAL AMPLIFIER.

Manufacturers : New Japan Radio

Image and pinout :

Some of the text within the PDF file :

NJM2058 MEMO [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. [ ... ]

NJM2058 PDF Datasheet Download