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https://www.instructables.com/id/ILC1-18L-Clock
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http://www.noritake-elec.com/itron/english/appli/vfd/apn201.htm
important doc about VFD display, and filament drive..
http://www.noritake-itron.com/SubPages/ApplicNotesE/vfdoperapn.htm
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http://pin.if.uz.zgora.pl/~jsieracki/VFD_VU.html
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http://www.turbokeu.com/myprojects/vfdclock/iw-18%20pinout.gif
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http://forums.bit-tech.net/showthread.php?t=112110