Hockey Puck SIT 2SK180 by Tokin source NOS

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This book was written by first generation transistor inventors and research pioneers.
What was incredible they present triode semiconductor concept idea in 1948.
Large scale and industrial production of vfet's was made in Japan.
I guess Professor Nishizawa have access to Shockley, Bardeen, Brattain documents
imported from USA who inspired Him to develop modernised sit's versions.

Birth of The Transistor: A video history of Japan's electronic industry.

Tohoku University , NEC|Tokin etc.