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PCE
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CPC Subgroup
H01J 21/36

Tubes with flat electrodes, e.g. disc electrode

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 flat electrodes, e.g. disc electrode