(eon)

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My upcoming article about Léon Theremin at will be postponed for the future... Why? Personal matters.
Pto Leon Theremin
I learned about the Great Seal/The Thing from this article, though, a bugging device designed by Leon Theremin, which is good trivia.
1993 Russian inventor Leon Theremin died, inventor of the theremin, one of the first electronic musical instruments.
Musical instruments named after their inventors: Theremin - Leon Theremin Sousaphone - John Philip Sousa Saxophone - Adolphe Sax ...