30mm symbol tube manufactured by Tesla

The ZM1041S is a special character indicator tube with red coating for better contrast. The character height of 30mm makes this tube a companion to numerical indicators like the ZM1040. Its a rare tube, beause it was produced in less numbers as the numerical indicators. I assume these tubes were used in applications where positions are envolved (X-Y-Z axis) or in measurement instruments. According to tesla's datasheet a clear-glass editon, the ZM1043S, also exists.
Same Types
Likely Tyes
Symbol height (mm)30
Decimal pointnone
Starting Voltage (typ)170 V
Maintaining Voltage (typ)140 V
Current per Segment4.5mA
Reccomend Resistor6.8kOhm = 4.5mA