15.5mm letter tube manufactured by Burroughs

The B-5018 is a clear glass letter tube manufactured by Burroughs. It can display various letters. This tube seems to be very rare and there i have not found any information about this tube
Brand / Manfacturer Burroughs
Same Types
Likely Tyes
Symbol height in mm 15.5
Characters / Symbols A,B,C,D,E,F,H,J,K
Decimal point none
Base / Socket 0
Starting Voltage (typ) tested at 170V, 10kOhm V
Maintaining Voltage (typ) 0 V
Current per Segment 0mA
Reccomend Resistor 0