DIFF Subgroup
H01J 23/08 Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Details of transit-time tubes of the types covered by group > Electrodes; Magnetic control means; Screens > Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
CPC:
Details of transit-time tubes of the types covered by group H01J25/00 > Electrodes; Magnetic control means; Screens (associated with resonator or delay system H01J23/16) > Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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