Operation manuals for clocks:
NIXIE DESK CLOCK 4-6 tubes (IN-12, IN-14, IN-18, etc.) YouTube manual
NIXIE WRIST WATCH 2 tubes (IN-16, Z5900, IV-6, etc.) Remote control Buttons
VFD WRIST WATCH (IV-9, IV-3, IV-8, IV-16, IVL2-7/5, etc.) YouTube
NIXIE CLOCKs (OLD version) (French version)