Editing Leon Theremin (section)

==Inventions==
*[[Theremin]] (1920)
*[[Burglar alarm]], or "Signalling Apparatus" which used the Theremin effect (1920s)
<!-- de: has Optical Theremin but no sources: Lichttheremin – reagiert auf Helligkeitsunterschiede (1923) -->
*[[Mechanical television|Electromechanical television]] – [[Nipkow disk]] with mirrors instead of slots (ca. 1925)
*[[Terpsitone]] – platform which converts dance movements into tones (1932)
*Theremin cello – an electronic [[cello]] with no strings and no bow, using a plastic fingerboard, a handle for volume and two knobs for sound shaping (ca. 1930)<ref>{{cite web |author=Peter Pringle |title=The Rebirth of the Theremin Cello |url=http://www.peterpringle.com/cello.html |access-date=2009-09-20}}</ref><ref>{{cite web |publisher=oddmusic |title=Theremin Cello |url=http://www.oddmusic.com/gallery/om29000.html |access-date=2009-09-20}}</ref><ref>Archived at [https://ghostarchive.org/varchive/youtube/20211211/xuRe_H1-Pe0 Ghostarchive]{{cbignore}} and the [https://web.archive.org/web/20081129020623/http://www.youtube.com/watch?v=xuRe_H1-Pe0 Wayback Machine]{{cbignore}}: {{cite video |people=Bryan (publisher and demonstrator) |date=2007-06-10 |title=Theremin Cello |location=Seattle |url=https://www.youtube.com/watch?v=xuRe_H1-Pe0 |publisher=Bryan |access-date=2009-09-20}}{{cbignore}} (demonstration playing of a theremincello)</ref><ref>Archived at [https://ghostarchive.org/varchive/youtube/20211211/3XhDCI_3Jbw Ghostarchive]{{cbignore}} and the [https://web.archive.org/web/20130226141702/http://www.youtube.com/watch?v=3XhDCI_3Jbw Wayback Machine]{{cbignore}}: {{cite video |people=Bryan (publisher and player) |date=2007-03-03 |title=Theremin's cello meditation |location=Seattle |url=https://www.youtube.com/watch?v=3XhDCI_3Jbw |publisher=Bryan |access-date=2009-09-20}}{{cbignore}} (slideshow including internal details of a theremincello replica)</ref>
*Keyboard theremin (ca. 1930), a small [[Musical keyboard|keyboard]] "with hornlike tones"<ref>"Radio Squeals turned to Music", ''Popular Science'', June 1932, p. 51, available on [http://www.popsci.com/archive-viewer?id=NygDAAAAMBAJ&pg=51 popsci.com] {{Webarchive|url=https://web.archive.org/web/20110916023934/http://www.popsci.com/archive-viewer?id=NygDAAAAMBAJ&pg=51 |date=2011-09-16 }}</ref>
*[[Rhythmicon]] – world's first [[drum machine]] (1931)
*The Buran eavesdropping device (1947 or earlier)
*[[The Thing (listening device)|The Great Seal bug]], also known as "The Thing" – one of the first passive covert listening devices; first used by the USSR for spying (1945 or earlier); it is considered a predecessor of [[RFID]] technology<ref>{{cite book |title=Hacking Exposed Linux: Linux Security Secrets & Solutions |publisher=McGraw-Hill Osborne Media |edition=third |year=2008 |page=[https://archive.org/details/hackingexposedli00hatc_0/page/298 298] |isbn=978-0-07-226257-5 |url=https://archive.org/details/hackingexposedli00hatc_0/page/298 }}</ref>
<!-- de: has Polyphones Theremin but no source: * Polyphonic Theremin (ca. 1960) -->
<!-- de: has Harmonium but no source: * [[Harmonium]] (1930s ... 1960s) -->