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1.Handbook-1 of Use of vacuum tube.Seibundo Shinko Corporation issued in 1966 this book.

2.Handbook-2 of Use of vacuum tube.Seibundo Shinko Corporation issued in 1966 this book.

3.Stereo mania. This separate volume of radio technology.

4.Circuits Gallery, which is handwritten on graph paper. I started making amplifier from 1967, the circuit of the nine have been described. Currently, There was left six among me.The mouse on the photo.