CPC Main Group
H01J 40/00 Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence)
2 direct subcodes
Child Classifications
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- H01J 40/02 Details
- H01J 40/16 having photo- emissive cathode, e.g. alkaline photoelectric cell (operating with secondary emission H01J43/00)