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using permanent magnets only
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CPC
H01J29/68
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Parent Industries
H
ELECTRICITY
H01
Electric elements
H01J
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H01J29/00
Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
Current Industry
H01J29/68
using permanent magnets only
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