鉱石検波器
↑ CRYSTAL SET AMPLIFIES Radio Digest, August 12, 1922, pages 1-2
↑ Expanded Audion and Vacuum-tube Development (1917-1930)
↑ A Sensational Radio Invention Radio News, September, 1924, page 291
↑ The Crystodyne Principle Radio News, September, 1924, pages 294-295, 431
↑ The "Transistor" -- an Amplifying Crystal QST, October, 1948, page 48