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PCE
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DIFF Subgroup
H01J 21/16

with external electrostatic control means and with or without internal control electrodes

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Vacuum tubes > Tubes with a single discharge path > having electrostatic control means only > with external electrostatic control means and with or without internal control electrodes

CPC:

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 > having electrostatic control means only > with external electrostatic control means and with or without internal control electrodes

No child classifications to compare. This is a leaf node in both IPC and CPC.