DIFF Subgroup
H01J 37/252 Tubes for spot-analysing by electron or ion beams; Microanalysers
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof > Tubes for spot-analysing by electron or ion beams; Microanalysers
CPC:
Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof (H01J33/00, H01J40/00, H01J41/00, H01J47/00, H01J49/00 take precedence) > Tubes for spot-analysing by electron or ion beams; Microanalysers
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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