DIFF Subgroup
H01J 17/50 Thermionic-cathode tubes
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Gas-filled discharge tubes with solid cathodes > Thermionic-cathode tubes
CPC:
Gas-filled discharge tubes with solid cathode (H01J25/00, H01J27/00, H01J31/00 - H01J41/00 take precedence; gas filled spark gaps H01T; Marx converters H02M7/26) > Thermionic-cathode tubes
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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