H01J17/58 - CPC Classification

Gas-filled discharge tubes with solid cathode; Thermionic-cathode tubes with more than one cathode or anode

• H01J17/60 » the discharge paths priming each other in a predetermined sequence, e.g. counting tube 0
• H01J17/62 » with independent discharge paths controlled by intermediate electrodes, e.g. polyphase rectifier 0