四極真空管 (Japanese Wikipedia)

Analysis of information sources in references of the Wikipedia article "四極真空管" in Japanese language version.

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archive.org

books.google.com

jogis-roehrenbude.de

nj7p.info

nvhrbiblio.nl

  • Donovan P. Geppert, (1951) Basic Electron Tubes, New York: McGraw-Hill, pp. 164 - 179. Retrieved 10 June 2021

patents.google.com

pocnet.net

frank.pocnet.net

worldradiohistory.com