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http://www.desmith.net/NMdS/Electronics/soculator.html
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http://www.sample.co.kr/clock/index.html
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http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Nixie/IV-4.htm
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http://www.akh.se/tubes/eyes.htm
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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.instructables.com/ex/i/B59...AD4E2CE10288F99001143E7E506/?ALLSTEPS
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http://www.ledsales.com.au/kits/nixie_supply.pdf
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http://positron.jfet.org/nixie-1
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http://chronotronix.com/sites/nixie/nixie-tubes.htm