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CPC Subgroup
H01J 21/04

without control means, i.e. diodes

Full Title

Vacuum tubes (H01J25/00, H01J31/00 - H01J40/00, H01J43/00, H01J47/00, H01J49/00 take precedence; details of vacuum tubes H01J19/00) > Tubes with a single discharge path > without control means, i.e. diodes