Vacuum tubes (H01J25/00, H01J31/00 - H01J40/00, H01J43/00, H01J47/00, H01J49/00 take precedence; details of vacuum tubes H01J19/00)

Child Classifications

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• H01J 21/02 Tubes with a single discharge path
• H01J 21/20 Tubes with more than one discharge path; Multiple tubes, e.g. double diode, triode-hexode
• H01J 21/34 Tubes with electrode system arranged or dimensioned so as to eliminate transit-time effect (with flat electrodes H01J21/36)
• H01J 21/36 Tubes with flat electrodes, e.g. disc electrode