with one cathode and one anode, e.g. glow tube, tuning-indicator glow tube, voltage-stabiliser tube, voltage-indicator tube (cathode-glow lamps H 01 J 61/64)
17
/
42
•
•
•
having one or more probe electrodes, e.g. for potential dividing
17
/
44
•
•
•
having one or more control electrodes
17
/
46
•
•
•
•
for preventing and then permitting ignition, but thereafter having no control
17
/
48
•
•
with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
17
/
49
•
•
•
Display panels, e.g. with crossed electrodes (gas-discharge-type indicating arrangements effected by the combination of a number of individual lamps
G 09 F 9/313) [3]
