Symbolical Nixie Tubes

Symbolic Nixie Tubes
IN-7, IN-7A, IN-7B (ИH-7, ИH-7A, ИH-7Б)
It has the same size as the IN-4.
Characters IN-7: ~ A k M - m Ω + Π V
Characters IN-7A: M + m % µ - К П
Characters IN-7B: S Hz V Ω

IN-15A, IN-15B (ИH-15A, ИH-15Б)
It has the same size as the IN-12A and IN-12B.
Characters IN-15A: μ P - + m M k Π % n
Characters IN15B: W F Hz H V S Ω A

IN-19A, IN-19B, IN-19V (ИH-19A, ИH-19Б, ИH-19B)
It has the same size as the IN-14.
Characters IN-19A: n К µ °C % M P m
Characters IN-19B: H А Ω Hz S F T V
Characters IN-19V: - A/B ~ Π % dB +

All tubes are brand new, never used, old stock (NOS), produced in Eastern-Europe/Eurasia (like Russain Federation) before the 80's. They rested in a warehouse in Siberia for decades! They will see the sunlight for the first time when they'll get unpacked! Definitely not taken out from ancient or wrong machines!

For the datasheets thanks for Dieter.