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http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Nixie/IV-4.htm
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http://www.desmith.net/NMdS/Electronics/soculator.html
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http://www.elektrohobby.de/Bauelemente/Transformatoren/?cur=1
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http://www.niell.org/tiny_clock/tinyclock.html
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http://www.teralab.co.uk/Glass_Blowing/Glass_Blowing_Menu.htm
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http://www.jogis-roehrenbude.de/Leser...immroehre-Stereo-Anzeige/Bargraph.htm
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http://users.rcn.com/ted.johnson/ssbar.htm
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http://www.sample.co.kr/clock/index.html
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http://members.chello.nl/r.dekker49/flyback/flyback.html